[[quoteright:350:[[http://io9.com/5735116/x+men-family-tree-breaks-down-mutant-mating-habits-with-surprising-clarity/gallery/ http://static.tvtropes.org/pmwiki/pub/images/xfam_1885.jpg]] ]]
[-[[caption-width-right:350:Omitted: Wanda (top left, framed in red)'s robot husband and their own Tangled Family Tree. Or Cable's adopted daughter who may or may not be his mother reincarnated. Let's leave it at that for your sanity's sake. [[http://www.geekosystem.com/an-annotated-x-men-family-tree/ (See full table with annotated names here)]]]]-]

->''"If you wannabe a Summers''\\
''You have got to live''\\
''Through time travel, death, and cloning,''\\
''But that's the way it is."''
-->-- ''Franchise/XMen'' filk, to the tune of "Wannabe" by the Music/SpiceGirls
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Tropes like LukeIAmYourFather, FamilyRelationshipSwitcheroo, SeparatedAtBirth, EveryoneIsRelated, MyOwnGrampa, CainAndAbelAndSeth and the EvilTwin make for drama, and they're an easy way of shaking up the dynamics of a long-running series. Sometimes a little ''too'' easy. Layer too many of those tropes onto the same group of characters, and what you end up with is a Tangled Family Tree.

This isn't just a DysfunctionalFamily, this is a family with members so numerous, relationships so tangled, and circumstances so bizarre that it's impossible to keep track of them without a flow chart.

Tangled Family Trees are commonly seen in comics and soap operas, both of which have long-running continuities focusing on one group of characters through decades of changing hands from writer to writer. It is also a common phenomenon in mythology, folklore, and oral traditions for much the same reasons (with "long running continuities" being measured in centuries, and different "writers", including oral retellings by people who may or may not have been literate). Indeed, tropes like ContinuitySnarl and the Tangled Family Tree happening in modern works of fiction can help us understand exactly how ancient mythology evolved.

Incest, time travel, cloning and genetic engineering, {{reincarnation}}, and {{Alternate Universe}}s can all contribute to creating a Tangled Family Tree. For obvious reasons, any family with a Tangled Family Tree is likely to be a BigScrewedUpFamily as well. If it's a case of RoyalInbreeding, this probably overlaps with RoyallyScrewedUp. Often this is a ContinuitySnarl looking for a place to happen, as sometimes a single geneology can become so complex that even the writers can't keep it straight. This is the kind of family that you ''want'' to in-breed just to consolidate the branches.

Compare OneDegreeOfSeparation, EveryoneIsRelated and LoveDodecahedron (which this trope can result from). Contrast SingleLineOfDescent.

'''SPOILER WARNING.''' These convoluted relationships tend to be tied in with every event in the plot, especially the family secrets.

----
!!Examples

[[index]]
* TangledFamilyTree/{{Literature}}
[[/index]]

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Manga/{{Bleach}}'': In the final arc, Ichigo's heritage is starting to look this way. [[spoiler: Ichigo and his two younger sisters are first cousins of Kaien, Kuukaku, and Ganju via their father Isshin, the Shibas' uncle. The Kurosaki siblings are also second cousins of Uryuu Ishida through their mother, Masaki, first cousin of Uryuu's father, Ryuuken. Since all Quincies descend from the villainous Quincy progenitor king, Ichigo (and Uryuu and both their families) is even related to the BigBad. And that's not even getting into the fact that at one point the Ishidas [[ArrangedMarriage wanted to marry]] [[KissingCousins Ryuuken off to Masaki]] as the heirs to the last remaining BlueBlood families. Or the fact that Kanae Katagiri, the woman Ryuuken [[MarryForLove married instead]], was a mixed-blood Quincy and thus ''also'' a relative, if a very distant one.]]
* ''Boys Empire'': The Tamura family tree looks a little like a tumbleweed by the end.
* In the [[Anime/FullmetalAlchemist 2003 anime version]] of ''Manga/FullmetalAlchemist'', Ed and Al [[spoiler: "give birth to" their own mother, only it's not their mother anymore, it's Sloth]]. Ed lost his arm and leg to the process, and Al lost his entire body. [[spoiler: Wrath's arm is Ed's so Wrath is in a way Ed. Wrath views Sloth as his mother, but Wrath's real mother was the woman]] who taught Ed and Al alchemy.
** There's also [[spoiler: Envy]] who is [[spoiler:a homunculus created from their half brother by their father Hohenheim]] and whose mother was [[spoiler:Dante, the BigBad,]] who created [[spoiler:Greed and Pride]] and tried to [[spoiler:commit GrandTheftMe on Rose]] so that Ed would fall in love with her.
*** [[spoiler: Actually, Sloth may very well be their real mother and Envy may very well be their real half-brother as it is implied that Homunculi are in fact the magical resurrection of the deceased, not just merely their magical clones. Lust certainly believed this to actually be the case.]]
** In the ''Brotherhood'' version, it's a little bit less tangled, but we still have [[spoiler:Father being created by an unnamed alchemist using Hohenheim's blood, making him either Hohenheim's "child" or his clone and the half-brother of Ed and Al, and the other Homunculi their nephews...]] and, among the Homunculi themselves, there's the fact that [[spoiler:the youngest "brother" has adopted the oldest as his "son". Only for a [[DeepCoverAgent cover]], but it's still strange]].
* Let's map the ''Franchise/LyricalNanoha'' family tree, which can be quite a doozy due to all the clones, adoptions, and miscellaneous ArtificialHuman-related goodness. First there's the Takamachi family with Nanoha, who's now the adoptive mother of Vivio, who's now also the adoptive daughter of Fate, who in addition to being the creation-daughter of Precia (who was seeking to remake her own daughter Alicia, who would have been Fate's older sister if she were still alive), is also the adoptive daughter of Lindy, connecting her to the Harlaown family which includes Chrono, Amy, Erio, and Caro. [[spoiler:Vivio was cloned from Olivie Segbrecht]], who has romantic ties with Klaus Ingvalt, the person Einhart was reincarnated from. [[spoiler:Vivio]]'s creator-father is Jail Scaglietti, who is also the creator-father of the Numbers, four of which are now [[spoiler:a part of the Nakajima family]], and is also the creator-father of Zest's clone, who was the father figure of both Lutecia and Agito. He was also the co-creator of [[spoiler:Fate herself]]. [[spoiler:Agito]] has since been adopted into the Yagami family, which includes Hayate, Reinforce Zwei, and the Wolkenritter. Speaking of the Wolkenritter, it includes Signum, who is implied to be [[spoiler:Agito's original Master]] and thus the person she was born from. Incidentally, Reinforce Zwei was born from the Linker Core organ of both Hayate and Reinforce Eins ([[spoiler:which had been merged]]). Back to the Nakajimas, Subaru and Teana seems to have romantic ties, and Subaru was going to adopt [[spoiler:Tohma, who is currently in a sort of LoveTriangle with Lily and Isis, and is also being sought out by the Huckebein family since they plan to adopt him into their family]]. All clear? Good.
* ''Anime/YuGiOhArcV'' combines this with LukeIAmYourFather. Yuzu and her three extra-dimensional counterparts (Selena, Rin and Ruri) are reincarnations of Ray, the daughter of TheDragon Leo Akaba, who was split into four when the original world was split into four dimensions. Leo is also the father of Reiji, whose has an adopted brother (Reira) through his mother, Himika. Yuzu also has another father, Shuzo (who may or may not be biologically related to her, though it's implied that he was merely given FalseMemories of being her father), and Ruri has unknown parents and an older brother, Shun. That makes Yuzu one-fourth of Reiji's older sister (despite being younger than him post-reincarnation) one-fourth of Leo's daughter and the whole daughter of her adoptive father, and simultaneously is and isn't Shun's sister. Reiji is somehow Shun's half-brother, despite not being related. [[MindScrew Shuzo has four daughters, despite only having one daughter.]] Reira, being adopted by Himika independently from Leo, is only related to his mother and Reiji. Yuzu and her counterparts are biologically Leo's kids, despite not fathering any of them.
* ''Manga/MahouSenseiNegima'' has one of these, once you bring all the relationships between the characters into it. A rough chart of these relationships looks [[http://img820.imageshack.us/img820/6298/negima2.png like this.]] Even if one would remove everything but the romantic and family ties, it would still be a mess. Naturally, time travel and the creation of sentient robots factor into this. If you think about it hard enough, you can actually make a case that [[AdorablyPrecociousChild Negi]] is [[RobotGirl Chachamaru's]] great-great-etc grandfather. [[spoiler: Chachamaru's "mother", Chao, is actually Negi's KidFromTheFuture.]]
* The [[spoiler: Kamina family]] in ''Anime/RahXephon''. Explaining it would spoil the show so you've been warned. The short version of it is that [[spoiler: half the cast is related to Ayato in one way or another]]. As for the long version: [[spoiler: Maya, Ayato's adoptive mother is actually his aunt. She was married to Watari who is Ayato's father. Ayato's real mother is Quon, Maya's twin sister. Quon lived with Itsuki who claimed to be her brother. He is actually her son and Ayato's twin brother. For further confusion let us take a look at how the Shitow family factors into this. Rikudou was Maya's adoptive father and is the uncle to Haruka and Megumi Shitow, who are sisters. Ayato met Haruka earlier but her name was Mishima before her mother remarried so he didn't know it was her when he met her the second time. This led to Ixtli the soul of the titular [=RahXephon=] taking her form to try to guide Ayato.]]
* ''Anime/TenchiMuyo'': [[http://vignette2.wikia.nocookie.net/tenchi/images/d/d8/Tenchi_ova_family_tree_updated.png/revision/latest?cb=20111201040846 This says it all, really....]] Words do not exist to refer to most of those familial ties. Most likely, if the people involved didn't all live so damn long (or possess magical symbiotic trees), the extended Juraian royal family would have traits that make the Hapsburg Chin look positively ''normal''.
** That doesn't even get into the alternate universes, including one featuring Tenchi's ''half-brother''.
** And when we add the fact that he gets a [[MarryThemAll harem]], that tree implodes and reshapes into something only understandable by [[Franchise/CthulhuMythos Abdul Alhazred or Old Man Whateley]].
* ''Manga/TsubasaReservoirChronicle'' has a family ''[[StableTimeLoop loop]]''- the main character is [[spoiler: the son of his own clone and [[OedipusComplex his girlfriend's clone]]. To be exact, his father is the reincarnation of his clone and his mother is the reincarnation of Sakura's clone]]. Explaining the complicatedness further would require a massive wall of text and an intimate understanding of both ''Manga/CardcaptorSakura'' and cross-multiversal genetics. This doesn't even take into account that [[spoiler:said parents [[RetGone got magically paradoxed both into AND out of existence]]]].
* The Joestar family in ''Manga/JoJosBizarreAdventure'' was a relatively straightforward family tree... then the eighties hit. Thanks to such incidents as Joseph sleeping around at the age 63 and a 122-year-old vampire running around with the Joestar progenitor's body from the neck down, the family now has such oddities as (great, great grand-)uncles half the age of their nephews and at least four family members with two biological fathers.
* ''Frozen Teardrop'', the novel-only continuation of ''Anime/MobileSuitGundamWing'', adds several new characters in the series backstory and giving them complicated relationships with the other established characters.
[[/folder]]

[[folder:Comic Books]]
* The Summers family of the Franchise/MarvelUniverse is a massive ContinuitySnarl to itself, and is so convoluted that at this point [[ComicBook/{{Cyclops}} Scott Summers]] may in fact be [[MyOwnGrampa his own grandfather]]. Ironically, Scott started out as an orphan with no known family.
** No fewer than four characters in the main continuity of the ''Comicbook/XMen'' comics can be said to be the child of Scott Summers, and none of them are more than [[ComicBookTime about ten years younger than their parents]]. Only one of them, Comicbook/{{Cable}}, was even ''born'' during the timeline of the main Marvel Universe, he's at least ten years ''older'' than his parents, largely because of all the massive TimeTravel in his backstory. And all of these children have no siblings in the continuities in which they live. These include his daughter with Jean, Comicbook/{{Rachel|Summers}}, and his daughter with Comicbook/EmmaFrost, Ruby. {{Lampshade|Hanging}}d when Comicbook/{{Storm}} tries to explain this to Joseph (himself a {{clon|ingblues}}e of the X-Men's arch-enemy Magneto) and nearly causes him to have a nervous breakdown.
** Cable himself has Stryfe, his [[CloningBlues evil clone]], who may be the father of his son Tyler (''a.k.a.'' Genesis) -- which is impossible to prove because Cable and Stryfe have identical DNA. His ''Comicbook/AgeOfApocalypse'' AlternateUniverse counterpart is [[Comicbook/XMan Nate Grey]], created by Mr. Sinister. And Cable's also adopted a daughter of his own, Comicbook/{{Hope|Summers}}, who may or may not be her own grandmother Jean reborn. Again, {{lampshade|Hanging}}d in ''Comicbook/NewMutants'' when Dani Moonstar tries (and fails) to explain to her friend, Nate's therapist, why he's acting so weird when Hope is around, and [[Comicbook/CaptainAmerica Steve Rogers]] relents and lets the X-Men take care of Nate as soon as he realizes that he's related to Scott.
** Scott's daughter Rachel had a son, Hyperstorm, with an alternate-reality Franklin Richards.
** Scott's brother Alex adds to the complication in the ''Comicbook/UncannyAvengers'' storyline, where he marries [[Comicbook/TheWasp Janet van Dyne]] in an AlternateUniverse BadFuture -- and have a daughter, whom they convince Kang to put in an isolated timeline so that she doesn't get RetGone while they try to SetRightWhatOnceWentWrong.
** Scott and Alex's long-lost father is the [[SpacePirates space pirate]] Corsair, and there's a third Summers brother, Vulcan, the supervillain ruler of a galactic empire. Vulcan himself is married to Deathbird, former sister-in-law to Charles Xavier (Scott's childhood father figure), meaning we can add ''him'' to the list now, too.
** It's implied that minor character [[XtremeKoolLetterz Adam X the X-Treme]] is the son of Catherine Summers and Shi'Ar Emperor D'Ken; Adam is [[HalfHumanHybrid half-human]], and Catherine was the only known human woman in Shi'ar space at the time. Although this was never confirmed in the comics, the [[WordOfGod writer confirmed]] that this was intended to be the case.
** The comic book ''X-Men: The End'' was an attempt by Creator/ChrisClaremont to wrap up [[KudzuPlot every plot thread he never got to resolve]], and he got there by turning ComicBook/{{Gambit}} into a Summers by making him a product of Mr. Sinister and Scott Summers' DNA. And [[http://www.uncannyxmen.net/sites/default/files/images/article/sinister.jpg the panel that started this whole mess]] only says "brothers" and doesn't imply a specific number, which implies even ''more'' Summers men.
** Cyclops is Comicbook/{{Galactus}}' father-in-law, although you do have to go through two different alternate timelines to get to that point. In the ''Comicbook/EarthX'' trilogy, it's revealed at the end of the first series that [[spoiler: [[ComicBook/FantasticFour Franklin Richards]] is destined to take Galactus' place. And more than one timeline shows that he and Rachel would have fallen in love as young adults had she grown up in her own time]].
* The Comicbook/ScarletWitch, Magneto's daughter, links the X-Men to another nightmarish family tree that's usually seen in ''Comicbook/TheAvengers'' and related titles:
-->'''Wanda:''' I think our family trees must be the most convoluted in ''history'', Vision!
** It starts with her {{robosexual}} relationship with Comicbook/TheVision, a robot built by another, evil robot Comicbook/{{Ultron}}, who was himself built by [[Comicbook/AntMan Henry Pym]]. Ultron has an OedipusComplex with both Pym and ComicBook/TheWasp, considering them both his "parents", and bent on killing them.
** The Vision was built using Comicbook/WonderMan's brain patterns -- in spite of Wonder Man being dead. When Wonder Man came BackFromTheDead, much like Vision, he had a crush on Wanda. Wonder Man's brother, the Grim Reaper, also considers the Vision his "brother". The Vision was also built (or not) using the body of the World War II-era Human Torch, which is a ContinuitySnarl of its own.
** The Vision and Scarlet Witch have two sons (thanks to magic). They were both [[RetGone erased from existence]], but then reincarnated into Wiccan and Speed of the Comicbook/YoungAvengers -- a team with a ''different'' Vision, rebuilt from the original's brain patterns by Iron Lad, a younger persona of the time-traveler Kang the Conqueror. This led to a love triangle between Stature, Iron Lad, and [[UpToEleven the Vision with Iron Lad's brain patterns]].
** The Vision also built himself a robotic family - Virginia, his wife, who was constructed with the Scarlet Witch's brain patterns, Vin, his son, and Viv, his daughter.
** Wiccan's main squeeze is Hulkling, who's the son of the original Comicbook/CaptainMarVell and the Skrull princess Anelle. Mar-Vell also had an artificially conceived and forcibly-aged son, Genis-Vell, with his lover Elysius (herself an artificially-created being from the DNA of the Eternals of Titan). Genis-Vell, with his vast cosmic powers, did a Universal {{Retcon}} -- and in doing so retroactively created his own sister Phyla-Vell. Then Phyla wound up with the Comicbook/GuardiansOfTheGalaxy and in a romantic relationship with Moondragon, the daughter of Mar-Vell's old ally Drax the Destroyer. And in an alternate future, Genis-Vell has two more children with Songbird of the Comicbook/{{Thunderbolts}}.
** Ultron didn't stop with the Vision: he created Jocasta (with Wasp's brain patterns), Alkema (from Mockingbird's brain patterns), and Victor Mancha (who joined the Comicbook/{{Runaways}}). In keeping with the Oedipal theme, Pym had a relationship with Jocasta after the Wasp died, and Alkema has a "daughter" named Antigone.
** And through Kang is a link back to the Summers family -- he's a descendant of [[Comicbook/FantasticFour Doctor Doom and Nathaniel Richards]], the latter of whom is Mr. Fantastic's dad -- and great-grandfather of Hyperstorm. This also throws in Nathaniel's family (including his other children), Kang and Immortus's litany of sons [[NamesTheSame named Marcus]], and Kang's lady friend Ravonna who posed as Nebula for a while.
** As of ''ComicBook/AvengersAcademy,'' the abomination that is the Pym family tree has another new branch in William Nelson, the son of Tigra, who is Hank's biological son via a Skrull infiltrator who was using his DNA at the time. From a certain point of view, this makes him Ultron's half-brother. A [[http://waitingforthet.tumblr.com/post/51584929655/im-gonna-start-posting-some-of-my-older-stuff-so fancomic]] poking fun at William's family tree shows Wiccan playing with baby William. Hulkling asks how they're related and after doing some math, Wiccan concludes that the toddler is his great-uncle.
** We can now add Nadia Pym, Hank Pym's long-lost daughter and the All-New Wasp. There is ''no way'' she's prepared [[http://waitingforthet.tumblr.com/post/146745834669 to meet her "siblings"]].
* Elsewhere in the ''X-Men'' universe:
** The X-Men's arch-enemy SelfDemonstrating/{{Magneto}} has a similarly snarled tree of his own. He initially had two children (aside from the one who died as a trigger to his StartOfDarkness), one of whom married into Comicbook/{{the Inhuman|s}} Royal Family, and the other of whom is the above-mentioned Scarlet Witch who married a robot (as described above). He then picked up another daughter, who's dating a Summers (oy). He also has an alternate reality granddaughter, Nocturne, who's the daughter of Comicbook/{{Nightcrawler}}, who has his own adopted family and a ton of half-brothers. And Magneto's ex-daughter-in-law just married Ronan the Accuser.
** Magneto has children with Comicbook/{{Rogue}} in at least two realities, Charles in ''Comicbook/AgeOfApocalypse'', and Magnus, a member of the original Exiles team, in another timeline. In ''Age of Apocalypse'', Rogue and Magneto's marriage created its own issues, because now Mystique and Destiny are both Magneto's mothers-in-law, Rogue is Quicksilver's step-mother (but somehow ''younger'' than him), Quicksilver is Storm's lover, and Rogue permanently absorbed roughly half the powers and personality of Polaris, Magneto's long-lost daughter who was on the enemy's side (but neither of them know it in this reality).
** Comicbook/{{Mystique}} is Comicbook/{{Sabretooth}}'s ex and mother of his son. She's later revealed to have also had children by ''both'' Wolverine and Charles Xavier. And she was also once planned to have been Nightcrawler's ''father'' (which would make Destiny his mother). It's also implied in ''Comicbook/WolverineOrigins'' that Wolverine is Sabretooth's half-brother.
** Thanks to {{time travel}} and [[LegoGenetics genetic engineering]], Longshot and Shatterstar are ''each other's'' fathers.
** In ''Comicbook/XForce'', Eli Bard modified himself using material taken from the Technarch Magus (father of Warlock), and used the material to resurrect several dead characters. These include Graydon Creed (son of Mystique) and some members of the Trask family (whose DNA was copied by Xavier's sister Cassandra Nova). This would add robots (including the Sentinels) to the mix, as well as Warlock's son Torgo.
** Comicbook/{{Wolverine}} originally only had an adopted daughter, but then his own family tree grew to include Comicbook/{{Daken}}, the son he never knew he had, and [[Comicbook/{{X23}} Laura]], his OppositeSexClone whom he later adopted. Then Laura discovered she had [[CloningBlues more clones]] of herself. And then we discover Logan's future son with Mystique and his [[Comicbook/OldManLogan time-displaced future self]].
* In Marvel Comics, the Olympian gods are just as twisted as their Mythological counter-parts, if not more so: The Elder Goddess Gaia is the sole "earth-mother goddess" of ''all'' of Earth's pantheons. She achieved this by, in different guises, mating with each pantheon's father god -- even those who were her own descendants. This means that all of the different gods of different pantheons are related to each other through her; [[Comicbook/TheMightyThor Thor]] is Zeus's uncle (and grand-uncle). As in real {{mythology}}, IncestIsRelative.
* The second ComicBook/GhostRider Danny Ketch and his late sister Barbara turned out to be SeparatedAtBirth siblings of the first one (if you don't count a Wild West character later renamed Phantom Rider), Johnny Blaze, and the spirit who inhabited Ketch's body, Noble Kale, is their ancestor by mother.
* Perhaps the only character able to give Summers a run for his money is Knuckles the Echidna in ''Comicbook/ArchieComicsSonicTheHedgehog''. His family tree is so large that he's related (sometimes closely, sometimes distantly) to almost every member of the supporting cast. One of whom is a crazy head in a jar working for Robotnik. He has ''three'' daughters from three alternate timelines -- all of whom lead different lives, an EvilTwin (of sorts) in Dr. Finitevus, and ''another'' evil twin in Anti-Knuckles. [[http://images4.fanpop.com/image/photos/16400000/Knuckles-and-Julie-Su-s-family-tree-julie-su-the-echidna-16473227-421-599.jpg This]] is an incomplete version of his family tree, and it's already super-convoluted; [[http://orig14.deviantart.net/7fa2/f/2015/297/d/5/knuckles__family_tree_by_willkeaton-d9e9eyv.png this fan-made complete version]] goes back 400 years, and even ''that's'' not far back enough, as Knuckles can trace his lineage back to Pachacamac, an echidna who lived over 4000 years ago.
* Franchise/TheDCU gives us the [[Franchise/TheFlash Allen/West/Thawne]] family -- the first two branches of which have a [[FeudingFamilies millennia-old feud]] with the third, at least partly because of how crazily related everyone is. The highlights:
** Inertia, genetically engineered from Bart Allen, also has some of Bart's grandfather's DNA. This grandfather was descended from the EvilTwin of Bart's ''other'' grandfather. This makes Inertia possibly the most inbred character in the DCU.
** Captain Boomerang, Jr. turned out to be Bart's half-brother with a parent from the future.
** Boomer, who's aged normally into his early twenties, might actually be ''younger'' than Bart's little brother. [[TimeyWimeyBall Blame time travel.]]
* Franchise/{{Superman}} has this happen both in his past (the House of El) and in several alternate futures. You have the Superman Dynasty, various [[CloningBlues clones and half-clones]], an adopted son who is the biochild of General Zod, a half-human son with ComicBook/LoisLane, Superman's cousin ComicBook/{{Supergirl}} who was RetGone and then brought back, Comicbook/PowerGirl, who is Supergirl from a different universe (with [[MostCommonSuperpower bigger assets]]), the GooGooGodlike Ariella Kent, the child of an alternate Superman and one of the ''other'' Supergirls (so not the cousin), Superboy-Prime (a teenage Superman from "our" Earth [[FaceHeelTurn gone bad]]), [[EvilTwin Ultraman]], [[Comicbook/FinalCrisis Overman]], any number of other AlternateUniverse Supermen -- the list goes on. Two alternate versions of Superman (from Earth-2/[[UsefulNotes/TheGoldenAgeOfComicBooks the 1930s version]] and from Earth-22/the ''Comicbook/KingdomCome'' universe) stopped by the main DCU in the 2000s; one of them died and came back as a Black Lantern.
* Decades of WesternAnimation/DonaldDuck and [[ComicBook/DisneyDucksComicUniverse Scrooge McDuck]] stories have left a respectably tangled family tree. All sorts of writers could make convenient new uncles or nephews of Donald or Scrooge, many of them for one-shot publications which [[ShortRunInPeru were only published in a single country and were obscure even there]]; nobody ''really'' knew what was going on elsewhere in the universe. Creator/CarlBarks was one of the most prolific at this; his successor Creator/DonRosa, intent on actually creating something resembling a continuity, tried to sort out an extensive (Mc)Duck family tree ([[http://static.comicvine.com/uploads/original/5/58127/2082411-l_us.jpg seen here]]), but even this only uses characters Carl Barks created. A fan tried his hand at a complete family tree in 2006 and gave us [[http://goofy313g.free.fr/calisota_online/trees/ducktrees/myducktree/index.html this]].
* ''Comicbook/{{Hawkman}}'' suffers so much from ContinuitySnarl that most writers [[ExiledFromContinuity just gave up]] trying to sort it out; as expected, he's got a badly tangled family tree, not so much due to time travel but rather lots of {{reincarnation}}. The short version:
** Prince Khufu of Egypt and his wife Chay-Ara are continually reincarnated. They become several familiar couples, including Brian Kent (himself a [[Comicbook/TheBraveAndTheBold possible ancestor of Jonathan Kent]]) and Lady Penbrook, and Nighthawk and Cinnamon. In the 1940s, they become Carter Hall and Shiera Saunders, who become the [[UsefulNotes/TheGoldenAgeOfComicBooks Golden Age]] Hawkman and Hawkgirl. They get married and have a son, Hector, who grows up to be the Silver Scarab.
** Hector marries Lyta Trevor, ''a.k.a.'' the Fury, daughter of the [[UsefulNotes/TheGoldenAgeOfComicBooks Golden Age]] Fury and adopted daughter of Miss America (itself a {{Retcon}}; Pre-Crisis Lyta was the daughter of the [[UsefulNotes/TheGoldenAgeOfComicBooks Golden Age]] Franchise/WonderWoman). Then he dies and ends up in The Dreaming, taking on the [[LegacyCharacter legacy]] of Garret "The Sandman" Sanford. He takes Lyta there to live with him, but when [[ComicBook/TheSandman the Lord of that realm]] returns, he's banished to the afterlife and Lyta is sent back to Earth. Lyta then has a son, Daniel.
** Daniel, meanwhile, goes on to become [[spoiler:the new Dream]], which makes him in some sense [[spoiler:a sibling to the rest of the Endless]]. This also makes him [[spoiler:Superman's spiritual uncle]].
** Shiera's cousin, Speed, has a granddaughter, Kendra, who tries to kill herself because of a Comicbook/PostCrisis ContinuitySnarl that led to at least three different Hawkmen existing in the same continuity. Shiera, without realizing it, takes over her body as a walk-in spirit and eventually becomes the new Hawkgirl in ''Comicbook/JusticeSocietyOfAmerica''. Meanwhile, Hector is reincarnated as the son of Dawn "Dove" Grainger and Hank "Hawk" Hall (no relation to any of the other Hawkmen running around), but he still thinks of Carter Hall as his father. Dawn's sister, Holly, became the new Hawk.
* The genealogy of ''Comicbook/ElfQuest'' is a nightmare, thanks to the elves' millennia-long lifespans, promiscuous mating habits, and tendency to forget who their relatives are after a few centuries or so. Almost every named character in the comic's 30-year run (to date) can be linked to every other named character through a complex chain of offspring, siblings, and significant others. Family trees turn out to be ''even more complicated'' than the books would suggest. Particularly Rain's primary family tree, which includes ''main'' characters Pike, Rainsong, Mender, Wing, Newstar, Kimo and Sust, and about twice as many ''secondary'' characters.
* The [[Franchise/{{Batman}} Bat-Family]] is a mild version of this (well, relative to other comics):
** Bruce Wayne has four adopted children: his adopted sons Dick Grayson, Jason Todd, and Tim Drake (the first three Comicbook/{{Robin}}s), and his adopted daughter Cassandra Cain (the third Comicbook/{{Batgirl|2000}}). Cassandra's biological parents are David Cain and Comicbook/LadyShiva, two of the world's most infamous assassins and Bruce's former teachers.
** Bruce also has a number of biological children. His son Damian Wayne, the fifth Robin, is the child of Talia al Ghul, daughter of one of Batman's greatest enemies, Comicbook/RasAlGhul. It's also revealed that Bruce has two biological sons, [[spoiler:[[WesternAnimation/BatmanBeyond Terry]] and Matt [=McGinnis=]]], thanks to [[LegoGenetics genetic manipulation]] and a surrogate father. In Earth-2 continuity, he has a biological daughter, Helena Wayne (''a.k.a.'' the Comicbook/{{Huntress}}), the daughter of Selina Kyle. The ComicBook/New52 ContinuityReboot left her stranded on the main DC Earth for a while.
** In the ''Comicbook/KingdomCome'' [[AlternateContinuity timeline]], Damian's counterpart Ibn al Xu'ffasch is romantically involved with Nightfire, who is herself the daughter of Dick Grayson and Starfire (which basically means she's dating her adoptive uncle).
** Not to be outdone, ComicBook/TheJoker claimed in one story that he was the son of Batman's confidante and adoptive mother figure, Dr. Leslie Thompkins. But the Joker's got an incredible MultipleChoicePast, so he's probably just making it up -- but we can't be sure. And one issue of ''Comicbook/{{Anarky}}'' revealed that the title character was the Joker's son; this was originally planned to be just the Joker playing mind games with Anarky, but the series was cancelled before they could get there.
* ''Comicbook/SwampThing'''s supporting character Tefe Holland is the daughter of Swamp Thing and Abby Arcane Holland. Tefe was originally a floating spirit called Sprout, who tried to find a body from a recently deceased person, was eventually given a body through Abby Holland's fetus, which was conceived through the Swamp Thing possessing [[ComicBook/{{Hellblazer}} John Constantine]] and having sex with her. Due to Constantine having the demon Nergal's blood in his veins at this time, Tefe is also part demon. She eventually became an Earth elemental like her father, beginning a line of human Earth elementals as a new Swamp Thing in Swamp Thing vol. 3, having all of her father's powers, but retaining a human appearance.
* In ''Comicbook/IronMan'' Ezekiel Stane is the son of Obadiah Stane, aka Iron Monger. Sasha Hammer is the granddaughter of Justin Hammer, and the daughter of Justine Hammer and the Mandarin. Ezekiel and Sasha are dating. If they ever have a kid, said kid will be related to all of Tony's archenemies.
[[/folder]]

[[folder:Fanfiction]]
* The Franchise/HarryPotter example below is implied in [[http://www.fanfiction.net/s/3024797/1/That_Malfoy_Family this]] [[HoYay Harry/Lucius Mpreg fanfic]], in which Harry thinks it's very crazy that he's carrying Draco's sibling when they're the same age.
-->'''Harry:''' This will be the weirdest family.\\
'''Draco:''' If you think that, you haven't seen the Malfoy family tree. ''*shuddering*'' That ''really'' isn't a pretty sight.
* A series of short Manga/VampireKnight fanfics (Iritís Daughter, Gertrudeís Closet, Jocasta at the Crossroads, and Vashtiís Feast) written by Ms Izzy takes the already messed up Kuran family and tangles it further. The fact that Yuukiís parents [[BrotherSisterIncest are canonically brother and sister]] seems tame compared to Ms. Izzyís version. While the family itself is pretty small, it is impressively tangled, with their unnamed mother being the product of another brother and sister pair, and upon her motherís death took it upon herself the continue the family line [[ParentalIncest with her own father]], giving birth to Rido and Haruka with him. It is further implied that she had conceived Juri with her brother/son Rido, rather than her father/husband. Not bad for a series thatís under 2300 words.
* ''Fanfic/ChildOfTheStorm'', being in large part based on the Marvel Universe and being written by a man who claims to actually understand the mess that is the Grey-Summers family tree, ''gleefully'' embraces this trope.
** '''Harry''' is the son of Thor, which makes Loki his uncle and Hela his first cousin. Then things get complicated, because...
*** Odin's mother was Theia, the Greek Titan Goddess of Light and Sight, and sister of Rhea, mother of Zeus. This means that Zeus is Harry's first cousin twice removed, tying Harry into the insanity of the Olympian family tree. On top of that, it makes [[spoiler: Diana]] his third cousin.
*** It's also been stated that pretty much ''all'' the pantheons of Earth are distantly related, so Harry's related to, among many, ''many'' others, Jesus Christ. The absurdity of this is {{lampshade|Hanging}}d and WordOfGod states, quite emphatically that this doesn't give Harry any special powers beyond what he's already inheriting from his father.
*** Lily, as it turns out, was Jean Grey's first cousin once removed, with the Grey family's famous red hair and green eyes. She also had a latent X-Gene, which seems to be manifesting in Harry.
*** [[spoiler: Lily has also been implied to be NotQuiteDead and, furthermore, to now be one with the Phoenix Force. The Phoenix is, in this verse, one of the [[{{ComicBook/Sandman}} Endless]], making Harry the son (sort of) of the Phoenix and the nephew of [[DontFearTheReaper Death]], Destiny, Dream, Despair, Desire and Delirium.]]
*** Harry's godmother is Wanda Maximoff, tying him into her family, which includes her father, {{SelfDemonstrating/Magneto}}, her brother (half-brother in this incarnation), Pietro, possibly her half-sister Lorna and [[spoiler: her daughter by John Constantine, Hermione Granger]].
*** On top of all of this, it's been suggested that, a very long way back, so far back that even Asgardians can't remember, the House of Odin and the [[{{Franchise/Superman}} the House of El]] might have intermarried. It's been noted, however, that if there were any Kryptonian genes left in Harry, there would be far too few of them to have any effect.
** '''Clint''', of all people, is a reasonable challenger for Harry in this regard. He's [[spoiler: the grandson of Bucky Barnes a.k.a. the Winter Soldier and his wartime sweetheart/fiancée Minerva [=McGonagall=]]]. But it doesn't end there. [[spoiler: Clint's mother, born after Bucky was presumed dead, Edith Barnes-[=McGonagall=], was given up by [=McGonagall=] under pressure from then Headmaster of Hogwarts Armando Dippet, and adopted by Hiram and Jessica Kent, and raised as the rather older - there's about a ten year age gap - sister of their son, Jonathan Kent, eventual husband of Martha Kent and father of Clark Kent.]] Among his ex-girlfriends is Wanda Maximoff, meaning that [[spoiler: for a while, he was technically step-father to Hermione Granger, Wanda's daughter by John Constantine]].
** [[spoiler: '''Steve''', though biologically about 28, is chronologically 90. He also, known only to a select few, had a daughter with Peggy, called Alison. She had two children, one of whom is [[Series/StargateSG1 Jack O'Neill]], who is in turn the father of [[ComicBook/{{Agent13}} Sharon Carter]]. The other child, Jack's sister, is the mother of [[ComicBook/MsMarvel Carol Danvers]]. Further complicating matters is the fact that Howard Stark was, secretly, Alison's godfather, tying the Rogers and Stark family trees together. Charles Xavier can also be thrown in, because he's Tony's godfather.]]
* The ''Manga/DeathNote'' TrollFic ''LightAndDarkTheAdventuresOfDarkYagami'' is an impressive continuity snarl that features Dark Yagami, Light Yagami's [[CopyCatSue Copy Cat]] MartyStu [[LongLostRelative long-lost sibling]] who is shagging [[ParentalIncest Light's mom (who is also his mom)]]. But it gets more twisted [[spoiler: he apparently went back in time and fathered himself and later became Light's dad]].
* The Lion King fandom practically revolves around this trope. There are full on wars just on who Nala and Kovu's fathers are. Plus, there's a full series of books that fill in some of the gaps and leave more for fans to speculate on, but just try stuffing them all in along with the [[RemembertheNewGuy Outsiders]] and you get [[http://hydracarina.deviantart.com/gallery/#/d55nrds something]] [[http://fanart.lionking.org/Artists/Koraden/ComprehensiveFamilyTreeV2.jpg that looks]][[http://rinjapine.deviantart.com/gallery/25046381 like these.]] '''Warning:''' The last one may result in an ArchiveBinge.
* In the Franchise/{{Transformers}} fanfic ''[[FanFic/ThingsWeDontTellHumans Things We Donít Tell Humans]]'', Cybertronian families are generally huge and complicated. Not only is adoption common among the main characters, it is also possible to independently adopt someone as a sibling without them being necessarily considered related to anyone else in your family (except any other siblings you share a [[TheEmpath brother-bond]] with).
* [[http://voltaliathemajestic.deviantart.com/art/Voltalian-Cartoon-Universe-Family-Tree-WIP-339430422 Voltalian Cartoon Universe Family Tree]] This family tree certainly is tangled AND huge. And that's just a work-in-progress. Rumor has it there's more she's added already.
* The [[FanFic/{{ITSMYLIFE}} MarrissaThe]][[FanFic/ITSMYLIFEExpandedUniverse Writer stories]] are certainly infamous for many family-connecting plot twists, and this is even before you consider the involved TimeTravel, [[CloningBlues cloning]], [[SharingABody body sharing]], [[InterspeciesRomance aliens]], [[{{Robosexual}} robots]], AlternateUniverse[=s=], [[TheLastOfTheseIsNotLikeTheOthers and]] [[BestialityIsDepraved animals]]. There even used to be a ''[=MarrissaTheWriter Family Tree=]'' drawn by [=ASBusinessMagnet=]; now, though, there are only [[http://marissathewriter.wikia.com/wiki/Jonson_family various wiki pages]].
* ''[[http://www.fanfiction.net/s/8359924/1/Deceptive-Reality Deceptive Reality]]'' probably takes the cake for shocking LukeIAmYourFather plot twists--Snape is revealed to be Harry's father but it gets even more complex with the revelations that [[spoiler: Snape is actually a Potter by birth and was James' twin brother but he was blood-adopted out to the Potter's family friend Eileen Prince and her husband]]. Also Lily isn't a muggleborn but she was adopted out to her squib relatives because her parents [[ItsNotYouItsMyEnemies feared she would be targeted]] seeing as she is the daughter of [[spoiler: [=McGonagall=] and Voldemort]].
* In ''[[https://www.fanfiction.net/s/8478250/14/A-Potted-Black-Rose A Potted Black Rose]]'' one Rosa Rosier had three daughters. The eldest, Olivia, was a squib who married Muggle Henry Evans and gave birth to squib Petunia Evans. The middle daughter, Druella, was mother to Narcissa, Andromeda and Bellatrix Black, while the youngest, Lillian, was Harry's mother.
* In [[Fanfic/DejaVuNoJutsu Deja Vu no Jutsu]], orphan shinobi are considered the ward of their jounin sensei. This makes Jiraya [[spoiler: Minato and Natsumi's 'father,' although she sees him more like an uncle, and the Sandaime Hokage their 'sort of' grandfather, since Jiraya was an orphan while learning under Hiruzen]]. Since Natsumi was also Hatake Sakumo's kenjutsu apprentice, this makes her [[spoiler: Eri's daughter, and Kakashi and Midori's sister]]. We also have all the honorary relationships between the clans that practically make them family. There is a complete explanation in story.
* In MassivelyMultiplayerCrossover fic ''Fanfic/BloodAndRevolution'', Bakura's family tree manages the impressive feat of getting snarled despite the fact that he's not supposed to be able to have children at all.
** [[Characters/YuGiOh Bakura]] magically fathers a child with an unnamed yuki-onna. This is [[Characters/CardCaptorSakura Yukito]].
** Yukito, who is also a GenderBender incubus / sucubus, becomes ''mother'' to a child, [[Characters/YuGiOh Ryou]], who is fathered by a human... who is possessed by a ghost. They say that technically Ryou's father is the ghost in a human body.
** Yukito later has triplets, with three different fathers - one from his own boyfriend [[Characters/YuGiOh Jounouchi]] (who turns out to be a long lost descendant of vampire Kenshin, one from [[Characters/RurouniKenshin Kenshin]], who is the head of his own vampire / youkai clan, and one from both [[ExtraParentConception Kenshin and Saitou]].
** Bakura "marries" into the [[Characters/YuGiOh Kaiba]] family, thus bringing in that small clan, who are actually already related to [[Characters/RurouniKenshin Saitou]].
** To top it all off, due to some magic Yuki's fifth child, [[Characters/CardCaptorSakura Yue]], is actually both Bakura and Ryou's son.
* In ''Fanfic/NoFeatherbedForMe'', Arya Stark escapes a marriage to [[spoiler: Renly Baratheon]] to run away with [[spoiler: Aegon Targaryen]], with whom she has three children. After [[spoiler: Aegon]] takes the Iron Throne, he sets Arya aside to marry [[spoiler: a Tyrell]], and has children with her. Meanwhile, Arya has an affair with [[spoiler: Gendry Baratheon]], who is married to [[spoiler: Sansa]], and they have a son. Then [[spoiler: Aegon]] remarries Arya [[spoiler: while his Tyrell wife is still alive, because Targaryens]], and they have two more kids. Arya's older son then marries [[spoiler: both his sisters, because Targaryens]], but [[spoiler: one of his wives]] secretly gets pregnant by [[spoiler: her half-brother (Arya and Gendry's kid) because that's ''less weird'']].
[[/folder]]

[[folder:Film]]
* In the ''Film/{{Transformers}}'' movie, Sam's [[http://tfwiki.net/w2/images2/c/c7/Witwickytree.jpg family tree]] apparently suggests two generations of inbreeding. It's more likely however that Sam just did a very poor job on his school assignment. Partially justified, since he likely used the assignment to advertise his stuff from eBay.
* In ''Film/TheDevilsRejects'', how the members of the Firefly [[TheClan clan]] are related to one another is complicated and never fully explained. Otis and Baby refer to each other as brother and sister throughout the movie; Captain Spaulding is Baby's father but doesn't appear to be related to Otis; Mama Firefly is presumably the mother of Baby, Otis (in ''Film/HouseOf1000Corpses'' they say she adopted him into the family) as well as Tiny, the deformed giant, and Rufus (from the beginning of the movie). Then we meet a black pimp named Charlie who Captain Spaulding says is his brother (presumably his half-brother).
** Really, this goes for almost all HillbillyHorrors-type films, due to presumed inbreeding, rape and forced "adoption".
[[/folder]]

[[folder:Live Action TV]]
* True to its comic book roots, the Petrelli family tree on ''Series/{{Heroes}}'' is slowly but surely getting its way there. It started with mom, Angela, sons Peter and Nathan, and Nathan's wife and sons. Then Claire is also revealed to be part of the Petrelli family as Nathan's daughter, tying in Claire's adopted family, the Bennets, and her biological mother Meredith. It is later revealed Meredith has a brother, Flint, and Angela has a long-lost sister, Alice.
** For a while, it was teased that Sylar was a third Petrelli brother, but this turned out to be a big fat lie. But Sylar has his own problems, as his relationships with his parents and their siblings are kind of screwed up. [[spoiler:Then he joined the Petrelli tree for real by becoming Nathan's ReplacementGoldfish. However, the brainwashing and mindrape eventually wore off mid-way through season four.]]
* Soap Operas are notorious for this trope, to give a few examples:
** ''Series/AllMyChildren'' - Bianca's first child is the result of rape by Zack's brother. Her second is the result of artificial insemination using Zack's sperm. Zack is/was married to Kendall, Bianca's sister, and they have a child. Kendall also had a child by Ryan who one donated sperm and was suspected to be the father of Bianca's second child, but was actually the father of another child entirely.
*** That doesn't even cover the half of it. Let's just consider the Chandler family for a moment. Adam Chandler has been married ''thirteen times'', and had two affairs. Between those marriages he had five children (Hayley, J.R, Anna, Colby, and Miguel) and raised Skye as his own before discovering they weren't related. And he adopted his nephew Scott. J.R had an affair with Annie (wife #13) to break them up, and now they've fallen in love. But Annie is engaged to Scott, and used to be married to Ryan, who she had a daughter Emma with. Ryan was engaged to Greenlee (who's also Emma's godmother), but she died and then came back and married David out of spite because Ryan had started a relationship with Madison. He also had a child with Kendall, Erica's daughter (and by the way, Erica married Greenlee's dad Jackson). But wait! Because Erica's been married just as many times (including to Adam) and almost fell in love with Caleb, who's the nephew to Palmer Cortland. And his ex-wife had an affair with Adam. Plus there's the situation with Tad. He lives in a house with two daughters, each from different previous marriages, has a grown up son who was also from a previous marriage, adopted Damon (who turned out to be his biological son anyways) and had a fling with Liza, who's Colby's mother, who's dating Damon. And then there's the fact Liza's mother married Adam's twin brother while Adam and she were married. It's like one giant loop-de-loop!
** ''Series/AsTheWorldTurns'' - The Snyder Family tree. Started out with salt of the earth Emma Snyder and her six children, which included Holden and Iva. Holden fell in love with Lily Walsh while working as a stable boy for her rich family. He later learns that that Lily is biologically Iva's daughter from a rape. By her cousin. But it's ok you see, Iva was [[NotBloodSiblings adopted]]. Holden and Lily then become a supercouple and the family tree only gets more complicated from there.
** ''Series/TheBoldAndTheBeautiful'' - The way that the Forrester and Logan families have intermingled over the years, made even worse by the fact that Brooke Logan has had children by Eric Forrester, Eric's stepson Ridge, and Ridge's half brother Nick Marone, while the rest of the characters don't seem to mind marrying and having children with their step relatives or the former spouses of their siblings/parents/children.
** ''Series/DaysOfOurLives'' - The Hortons and the Bradys have also intermingled several times (to the point where they may as well be one family, even though the writers don't quite see it that way), not to mention several connections with the Kiriakis and [=DiMera=] families. (The latter apparently leading to John Black being his own uncle... somehow.)
** ''Series/{{Eastenders}}'' - The Fowler-Beale clan was once quite extensive but has largely been supplanted by the extensive Branning-Jackson clan. In fact one character, Liam Butcher, is the blood relative of half the cast due to the fact that his mother Bianca Jackson belongs to both of the aforementioned clans, while his father Ricky Butcher has a few connections of his own.
*** How about the Mitchells? More just seem to be coming out the woodwork and creating more havoc for Walford Street. There was even a plot about The Secret Mitchell [[spoiler:with Ronnie having a long-lost daughter she thought was dead, [[ShaggyDogStory only for her]] [[KilledOffForReal really die once she finds out the truth]]]].
** The [=McQueens=] from ''Series/{{Hollyoaks}}'' are an JustForFun/{{egregious}} example despite only appearing on-screen for three years (with {{Retcon}}s of course saying they've lived there for over a decade and some members to have actually been [=McQueens=] but with different surnames), even having multiracial members [[spoiler:and a vengeful son]].
** ''Series/{{Graduados}}''. In the beginning, Martín was the son of Loli Falsini and Pablo Catáneo, and everybody was happy. Then the telenovela began, and Loli realized that Martín's true father was Andy Goddzer, who had a one-night relation with her during the high-school graduation night in 1989. It was confirmed with a DNA test. This gave Martin a whole new family, and a total of 2 parents and 3 grandparents. Pablo has a brother, Augusto. Clemente Falsini, Loli's parent, got married with the younger Patricia, who in fact attended high school with Loli. And then... Pablo and Patricia had a secret romance, and Pablo left Patricia pregnant, but they told everybody that it was Clemente's son.
** ''Series/OneLifeToLive'': Among the usual twists and turns, Jessica Buchanan is related to CJ and Sarah Roberts through both their father Cord (she is Cord's half-sister, making her their half-aunt) and their mother Tina (who is ''her'' half-aunt, making them her half-cousins as well).
** ''Series/GuidingLight'': Two women were married to each other's fathers, making them simultaneously each others stepdaughters ''and'' stepmothers.
* ''Series/{{Angel}}'' has some issues with this as well. Considering that the show [[OurVampiresAreDifferent treats siring like family]], you have The Master siring Darla, Darla siring Angel, Angel siring Drusilla, and Drusilla siring Spike. Then Angel killed Darla, who was brought back to life as a human. Then Drusilla sired Darla again, making her--as Dru puts it--both Darla's granddaughter and mother. By extension, this makes Darla Angel's mother and granddaughter and Spike her brother and great-grandchild. Then Angel and Darla screw like bunnies, defy the laws of the natural universe and conceive Connor, Angel's son, who, by the whole siring thing, is also Angel's brother and great-grandson. Then Connor sleeps with Cordelia (who Angel is in love with) and conceives Jasmine, Angel's completely evil granddaughter/niece/great-great-granddaughter. And this isn't taking into account that Angel probably sired even more vampires than Dru and Spike, including Penn from the episode "Somnabulist" and, possibly, James and Elizabeth from "Heartthrob". So, theoretically, any on-screen vampire younger than Angel is theoretically "related" to him. Plus, there's the fact that in [[Series/BuffyTheVampireSlayer Buffy Season 7]] Spike sired a whole bunch of vamps under the First's control, who may have sired others. Angel also sired at least two other vamps in his past, who may have turned others as well.
** Cordelia also had at least one other pregnancy that didn't go to term (a good thing, since it would have killed her in being born). And considering Buffy's romantic involvements with both Angel and Spike, it's something of a relief that Buffy Summers and Scott Summers aren't related...
*** In many a fanfic, they are, adding a hitherto unmanaged dimension of supernatural weirdness to the whole mess.
*** Fanfic nothing, according to {{Word Of|God}} Creator/{{Joss|Whedon}}, in one of the two times he got a chance to write Cyclops, he tried to fit in a bit of dialogue where he references a 'third cousin who thinks she spends her time fighting demons'.
* In ''Series/ThePretender'' you have Jarod who is the son of Charles and Margaret and has a brother Kyle and a sister Emily. He also has a half-brother Ethan who is the son of Charles and Catherine Parker. Catherine also being the mother of Ms. Parker and her long lost twin brother Mr. Lyle. The twins thought their father was Mr. Parker but in reality his long lost brother Mr. Raines is their true biological father and Mr. Raines also had another child Annie with his wife Edna. Oh and Brigitte's son may be the son of Mr. Lyle or his uncle/father Mr. Parker.
* Have you ever tried to draw out the family trees on ''Series/TheOC''? It's upsetting. At one point Ryan was dating his long-lost illegitimate adoptive aunt. Then got back together with his Marissa, his step-adoptive aunt [[spoiler:who later became his biological stepsister]]. It should be noted that by the time the spoilered development occurred, [[spoiler:Marissa was already ''dead'']].
* ''Series/BigLove'': Thanks to the multiple marriages and multiple wives in the polygamist compound of Juniper Creek--"Prophet" Roman Grant alone has 31 children and 187 grandchildren-- figuring out who's related to whom can be an impossibly arduous task. As expressed by (one of) Roman's wife('s), Adaleen: "I'm my own grandmother."
* On ''The New Adventures Of Old Christine'' this didn't end up happening, but was played with a lot when Old Christine was dating New Christine's father, and New Christine was dating Old Christine's ex, Richard, with whom Old Christine had a son. There was one scene where Old Christine was trying to diagram their family tree if both of these relationships ended in marriage.
* On the Australian comedy-drama ''Series/{{Offspring}}'', the Proudman family seems to be getting like this. The father Darcy has two girls (Main Character Nina and Billie, who couldn't bear a child with her partner so she got sperm donated from his brother instead, but that went down the [[ConvenientMiscarriage gurgler]]) and a boy (Jimmy) by his estranged wife Geraldine and a son (Ray) from a one night stand from Nina's work mate Cherie. And now Jimmy has impregnated Nina's other work mate Zara. That's nothing right? [[spoiler: It gets more complicated at the end of Season 2 when it's revealed that Darcy isn't Nina's father. Which makes her not related to baby Ray at all.]]
* On ''Series/OneTreeHill'' Karen had a baby, Lucas, with Dan Scott who had another son, Nathan, with his wife Deb six months later. Years later Karen ends up getting pregnant by Dan's brother Keith. Her daughter, Lily, is technically both Lucas's half-sister and his cousin.
* Lister from ''Series/RedDwarf'', who ''gave birth'' to twins via impregnation with ''his'' parallel universe female self[[note]]You read that right[[/note]], and is also [[MyOwnGrampa his own father]] by an alternate universe Kochanski. Which means his children have only 50% genetic material they should have.
* On ''Series/AmericanHorrorStoryMurderHouse'' Constance has four kids (three of whom we meet). Her son Tate ends up [[spoiler: impregnating Vivien, who also gets pregnant by her husband Ben on the same day, meaning her twins have different fathers]]. Meanwhile, Tate falls in love with Vivien and Ben's daughter Violet. And all of this crazy happens before we bring up the fact that [[spoiler: Tate is also a ''freaking ghost'']].
* ''Series/MarriedWithChildren'': "In Wanker County, nobody's really outside the family."
* ''Series/DoctorWho'' gets into this with the Ponds, properly starting from new series late season 4 onwards. Amy and Rory are together and have a daughter, Melody, who was named after their childhood best friend, Melody. Amy, however, fancies the Doctor and forces him into a kiss early on. Melody turns out to be River Song, who eventually marries the Doctor and is ''also'' Amy's and Rory's best friend Melody, accidentally named after herself. On top of that, Melody's second mother is the TARDIS, who considers herself married to the Doctor and has a rather romantic (as well as biologically symbiotic) relationship with him. Things get more complicated when Amy accidentally marries Henry VIII in a throwaway gag -- because the Doctor, rather briefly, married Queen Elizabeth I, who happens to be Henry VIII's daughter, making her simultaneously his biological mother-in-law ''and'' his step-mother-in-law. And in the middle of all that, the Doctor seems to start fancying Rory a bit and snogs him for no reason.
** Gets even more twisted in "The Husbands of River Song", the Doctor and River have both [[NoodleIncident at differant points in time been married to]] [[BiTheWay Cleopatra.]]
* ''Series/OnceUponATime'' has this in spades with Henry. His mom is Emma. His dad is [[spoiler: Baelfire, Rumpelstiltskin's son]]. His grandparents are Snow White, Prince Charming, and [[spoiler: Rumpelstiltskin and his late wife Milah]]. He has five sets of great-grandparents: two from Charming (his birth mother Ruth and her husband; and his adoptive father King George and his wife), one and a half from Snow White (her birth parents are King Leopold and Queen Eva, and Leopold's second wife, Henry's step-great-grandmother: Regina, who is also his adoptive mother. Thus making Henry his own great-uncle.), [[spoiler:Rumpel's parents - Malcom/Peter Pan and the Black Fairy]], and Milah's unidentified parents.
** There's also Charming's late twin brother James, Regina's mother Cora (the Queen of Hearts) and father Henry; and [[spoiler: Henry's great-aunt, Regina's long-lost half-sister Zelena, AKA the Wicked Witch of the West]]. And since [[spoiler: the immortal Rumpelstiltskin]] apparently had a [[MerlinAndNimue mentor with benefits]] relationship with Regina's mother, Cora, leading to some speculation that ''he'' is Regina's father... Charming hangs a big, fat lampshade on the mess by saying it's a good thing the Fairy Tale culture doesn't have Thanksgiving--because that dinner would be awkward as hell.
** [[spoiler: The end of season 3 adds Henry's newborn uncle Neal, the son of Charming and Snow White, and Rumpel's second wife Belle and HER parents, Sir Maurice/Moe French and Collette, to the mix.]]
** Season 4 adds [[spoiler:Zelena, Regina's half sister, being pregnant via rape by fraud with Robin (Regina's love interest). Regina is going to be the step-mother of her niece!]]. Season 5 [[spoiler: reveals Belle's pregnancy, adding another uncle, named Gideon in season 6, who's younger than Henry.]]
** Throw in the fact that due to time travel and curses, Henry's parents, grandparents, step-grandfather, step-great-grandmother, and new paternal step-grandmother are all approximately the same age (late twenties to mid-thirties).
** LampshadeHanging in the episode "Family Business", when Elsa learns the Snow Queen (who, incidentally, was also Emma's foster mother for a year, and views her as a surrogate sister) is her aunt:
--->'''Elsa''': Her name is Ingrid. I didn't even know my mother had any sisters. I'm as surprised as you are.\\
'''Hook''': Spend a little more time in this town, love, and you'll realise just about ''everyone's'' related.
** When Rumple and Emma encounter Milah, Rumple's ex-wife in the Underworld, he recounts to her the whole tangled mess of their family, especially since Hook is the man Milah left Rumple for. Milah's dumbfounded reaction is priceless.
-->'''Milah''': You've been with my former lover...''and my son?''
* Lady Olenna Tyrell gives a speech about this on ''Series/GameOfThrones''. Her granddaughter Margaery is getting married to the current king, Joffrey, and her grandson Loras is betrothed to the king's mother, which would make him the king's stepfather and brother-in-law. Then she goes on to explain how any children would fit in.
* In the ''Series/HistoryBites'' episode "The Filthy Stinking Rich", the penchant of the Rothschild family (see Real Life section) for marrying within the family to keep their wealth from being scattered among countless sons-in-law and daughters-in-law is depicted in a sketch in which Charlotte Rothschild[[note]] daughter of Nathan Rothschild, patriarch of the London Rothschilds[[/note]] shows her family album to her fiance and first cousin Anselm Rothschild[[note]] son of Nathan's brother Salomon, who took over from his father as patriarch of the Vienna Rothschilds[[/note]] - while he rolls his eyes and repeatedly points out that they're also ''his'' family.
* ''Series/ModernFamily'':
** In an early episode, Luke (Claire's son) gets in a fight with Manny (Claire's father Jay's step-son) at school because Manny wouldn't stop referring to Luke as his nephew. Manny has also been known to refer to Claire and Mitchell (Jay's son) as his brother and sister, and at one point Haley (Claire's daughter) tried to have an unsupervised party by telling her mother "my uncle agreed to chaperone," without mentioning that she meant Manny. [[WiseBeyondTheirYears The fact that Manny actually made a pretty good chaperone just meant the joke was on her]].
--->'''Principal:''' I gather that you're all related... somehow.
** Played for a quick joke, as everyone struggles to figure out how Jay and Gloria's new baby is related to each of them.
* ''Series/{{Sisters}}'': Teddy's ex-husband marries her younger sister Frankie, making Frankie simultaneously an aunt and stepmother to Teddy and Mitch's daughter Cat. When Frankie and Mitch have a child of their own, the child is both Cat's cousin and her half-brother. Adding yet another twist, because Frankie had fertility problems, Georgie had to serve as her surrogate, meaning she gave birth to her own nephew. And because of this, Georgie had considerable problems acknowledging that the child was Frankie's, not hers.
[[/folder]]

[[folder:Music]]
* "[[http://www.youtube.com/watch?v=zeIsxXDyjlc I'm My Own Grandpa]]", which manages to create the eponymous situation with neither {{Incest|IsRelative}} nor TimeTravel, just a couple of unlikely marriages. If you marry a widow, and your father marries that widow's daughter, you become your own grandpa... in-law. Most of the song is working out the relationships when both families start having children.
** Also, though this isn't pointed out in the song, the two children that are born are simultaneously each other's uncle and nephew, biological both ways, [[MindScrew again, without incest]].
* "None but the Lonely Heart" -- A Music/SpikeJones Soaperetta.
[[/folder]]

[[folder:Radio]]
* ''Radio/TheArchers'' has a bit of this going on. The website provides some [[http://www.bbc.co.uk/radio4/features/the-archers/whos-who/family-tree family trees]].
[[/folder]]

[[folder:Religion & Mythology]]
* Pretty much every named character in Myth/ClassicalMythology can be placed somewhere on one massive and convoluted family tree. This is partly because the "long-running continuity" we're talking about here stretched over centuries of oral tradition and scores of different storytellers, and partly because... well... [[TopGod Zeus]] [[ReallyGetsAround slept around]] '''[[AnythingThatMoves a lot]]''', including his sisters. Seriously, on any given family tree he's everyone's ancestor in at least two different places.
** It really doesn't help that the Olympian gods, who via traditional and less-than-traditional means birthed the majority of the gods, were children of the Titans, who were themselves the children of Gaia and Ouranos ([[IncestIsRelative see a pattern]]?), and that Zeus was far from the only one who considered monogamy beneath him.
*** Things got off to a great start as Ouranos already was Gaia's son - she gave birth to him unassisted by any male - so 'his' children, the Titans, the Furies, the Gigantes, the Hekatonchieres, the Cyclopes etc., were also his siblings.
** Family trees became especially convoluted due to Zeus' recurring habit of sleeping with descendants of his -- for instance, he fathered the little-known god Zagreus with Persephone, his daughter by his sister Demeter, and Herakles with Alcmene, the granddaughter of his son Perseus. To add extra complications, there were several instances of mortal women having children by both their divine lover and mortal husband, often as fraternal twins (in at least one case one mother was simultaneously pregnant by Hermes and Apollo in this way), although in one case, it happened with a single child (Theseus, who was the son both of the god Poseidon and the mortal King of Athens Aegus, whom his mother Aethra had bedded in the same night). The most well known example is Leda, whose children were Castor and Clytaimnestra (fathered by her husband Tyndareus) and Polydeuces and Helen (fathered by Zeus) (Yes, all at once. Leda laid two eggs, as [[InsaneTrollLogic Zeus had mated with her in the form of a swan]]).
*** And then there were some complicated relationships brought about by the trope of PairTheSpares. For instance according to an Italian tradition, after Odysseus (Ulysses to the Italians) was killed by Telegonus, his son by Circe, Circe granted immortality to Ulysses' widow Penelope and her son Telemachus. Circe married Telemachus and Penelope Telegonus, having sons called Italus and Latinus respectively. So Circe and Penelope both became each other's mother and daughter-in-law, and Telemachus and Telegonus each got a nephew who was also their half-brother.
** Every mythological hero, and everybody who fought at Troy, needed to have the dignity of coming from a line descended from the gods, and so pretty much every mortal lineage was shoehorned into the Olympian clan by some author (or by multiple authors, using different genealogies, for added confusion!) Then there's the ancient Greek habit of marrying one's nieces...
*** Authors also disagree about the genealogy of some of the deities, for instance according to Hesiod Aphrodite was born from the foam spilled from Ouranos' cut-off genitals (making her Zeus' aunt), while according to Homer she is the daughter of Zeus and the minor earth-goddess Dione[[note]]who may or may not have been a regional alias of Zeus' mother, Rhea[[/note]]. According to some traditions Hephaistos is a son of Zeus and Hera, while according to Hesiod Hera had him without a sperm-donor. According to the most popular myth, Eros is the son of Aphrodite and Ares, another son of Zeus, but Hesiod's "Theogony" makes him one of the oldest of gods, a brother of Gaia brought forth by Chaos.
* ''Any'' mythology that includes a distinct pantheon can fall into this trope harder than... [[BuffySpeak something really heavy]]. For a single example, see Loki (Myth/NorseMythology) and his various children, of some of whom he is the father and others the ''[[GenderBender mother]]''.
* In the modern religion of Wicca, even limiting the pantheon to only two deities does not stop the Tangled Family Tree from cropping up. According to the generally-accepted "Wheel of the Year" symbology, the God is his own father, by the Goddess, who is also his ''sister.'' If you want to keep yourself up for the next few nights, try working out all the relationships that imples--or worse, try to figure out where the God would get his heavenly genes from!
* How about Myth/KingArthur? Arthur is the son of Uther and Ygraine, and Ygraine's children from her first husband are Morgause (wife of Lot and mother of Gawaine and his brothers, including Mordred, who may or may not be [[BrotherSisterIncest Arthur's son]]), [[SpellMyNameWithAnS Morgan/Morganna/Morgaine La Fay]] (wife of Urien and mother of Yvain/Owain, who marries Laudine, who's the ex-wife of one of several Red Knights), and Elaine of Garlot (who is the mother of Elaine the Younger). But Ygraine's first husband was the Duke of Cornwall, which implies some sort of relationship between this family and Mark, who's the Duke of Cornwall when Arthur is king, and is the uncle of Tristram. And then there's Constantine of Cornwall, who succeeds Arthur as King, and is the son of a ''different'' Duke of Cornwall, Cador, who is Arthur's half-brother or cousin and who also raised Arthur's wife Guinevere as his ward. (And who may or may not be the same as Cador the father of Kay's wife Andrivete, or Cador the brother of Caradoc the Younger's wife Guinier, both Arthur's knights and the former his foster-brother.) Meanwhile, Lancelot is the son of King Ban and his wife Elaine of Benoic, is raised by the Lady of the Lake (who could be the one who gave Arthur Excalibur, the one who had a relationship with Merlin, or both), is loved by a woman named Elaine of Astolat, and fathers Galahad on Elaine of Carbonek, who's the daughter of the Fisher King, who's the brother of King Pellinore (Percival's father or uncle, and the father of Elaine of Listenoise), whose son Lamorak goes on to have an affair with ... Morgause. ''Webcomic/ArthurKingOfTimeAndSpace'' {{lampshade|Hanging}}s how confusing this gets [[http://www.arthurkingoftimeandspace.com/0806.htm here]].
* ''Literature/TheBible''. Some people have literally spent decades trying to wrap their heads around that mess.
** The Gospels of Matthew and Luke each give a genealogy for Joseph (who is Jesus' stepfather, no biological relation at all, but never mind that...) reaching back through King David. However, Matthew claims the descent was through David and then Solomon, while Luke traces it through another son of David, Nathan. Matthew only traces the descent back to Abraham, but Luke goes all the way back to Adam - who, in some translations, is listed as the son of God, which would make him the (half-?)brother of Jesus.
*** The Solomon/Nathan issue can be somewhat sorted out if one was a maternal ancestor before swinging back into the main paternal line. The Bible counts some of the maternal ancestors as important as their paternal counterparts.
** Note that Matthew and Luke already disagree about the names of Joseph's father, paternal grandfather, and his father - Matthew names them as Jacob, Matthan and Eleazar, Luke as Eli, Matthat and Levi.
** Adam is technically Christ's ancestor, and depending on your religion, his son, since Christ, being the Son of God, is also God in his own right, again, depending upon which religion you follow. So Adam could be Christ's great x10000 grandfather and his son and half-brother all at once. But that's a bit of a stretch on the norm...
** Made worse when you realize that he had to be a ''biological'' heir via ''Mary'' to fulfill the prophecy, and also a ''legal'' heir under Jewish law to be legitimate. The biology alone is tangled, but the fact that it had to conform to Jewish inheritance law made things even more complicated.
*** The 'mess' might be less of one if you consider that the genetics involving Jesus works on two levels, one pertaining to his God-heritage and one to his human heritage. Note also that Adam was a creation of God's (with Jesus present, just unmentioned), and so was not God's son on quite the same level as Jesus. As a final note, the Davidic genealogies might be divided such that Joseph comes from the line of Solomon and Mary from the line of Nathan through Eli, making Joseph Eli's son-in-law.
[[/folder]]

[[folder:Stand-Up Comedy]]
* One of Jeff Foxworthy's indications of being a redneck:
-->"If your family tree does not fork, you might be a redneck."
[[/folder]]

[[folder:Tabletop Gaming]]
* The Scarlet Dynasty from ''TabletopGame/{{Exalted}}''. Thirteen Houses, each descended from a particular child or consort of the 700-year-old [[TheHighQueen Empress]], all of whom are mostly marrying with each other in all shades of KissingCousins. And since they live to be 300 and are physically in the prime of their lives until a few years before their deaths, there's a lot of [[MayDecemberRomance 200-year-olds marrying young 20-year-olds]], making for kinship relations more convoluted than almost anywhere else.
** Try living in Malfeas, the Demon City, where a significant portion of the local vocabulary is devoted to describing such phenomena as being related to someone's twenty-seventh soul, being the whole-greater-than-the-sum-of-its-parts of hundreds of [[DemonLordsAndArchdevils demon lords]], or living in a portion of the landscape that happens to also be [[GeniusLoci your father.]]
* The original Black Box edition of the TabletopGame/{{Ravenloft}} setting included a series of family trees for such prominent bloodlines as the Boritsis, d'Honaires, Weathermays and Von Zaroviches. As the purpose of these was to seed people's Ravenloft campaigns with story ideas, each tree had several built-in plot hooks, and a few were connected to others through intermarriage or the like.
* ''TabletopGame/{{Scion}}'' being a game about the modern children of the gods of myth, it's entirely possible that any given PC is part of this (as seen under Religion & Mythology).
* The Great Houses and their vassal lords in the Inner Sphere in the hex-based tactical game ''Franchise/BattleTech'' is a tangled mess. One particular knot revolves around one Victor Steiner-Davion and his progeny. Born to Melissa of House Steiner, the ruling family of the Lyran Commonwealth, and First Prince Hanse of House Davion, rulers of the Federated Suns. His mother was daughter to one of the greatest Archons in recent Lyran history, and his father was ''the'' MagnificentBastard of the story. Victor would later sire a son with [[StarCrossedLovers Omiko Kurita]], daughter of the ruling family of the Draconis Combine and ancestral enemy of the Davions (and he would only learn of this son [[LukeYouAreMyFather long after he had grown to adulthood]] and Omi had been assassinated). He would also wed [[SecondLove Isis Marik]], illegitimate daughter of the "Real" Thomas Marik, of the ruling family of the Free Worlds League, the ancestral enemies of his mother's family. He then fathered three children with her.
* Enforced with the Navigator houses of ''{{TabletopGame/Warhammer 40000}}'': the gene that allows Navigators to "see" into the Warp and lets them guide ships through it isn't expressed when a Navigator breeds with a normal human, resulting in massively inbred families (and the results aren't pretty: freakishly elongated, blind, and growing a third eye that has to be blindfolded otherwise it instakills anything looking at it).
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/{{Pirate 101}}'' has perhaps one of the most massive cases of this - '''all''' of Monquistia is at least a third cousin of some former king. Their marriages are so twisted and tangled that the family trees look like cobwebs made by drunken spiders.
* For a fairly short game, ''VideoGame/JadeEmpire'' packs in a lot of secret relatives of the Emperor. Every single one is introduced well before their particular [[TheReveal Reveal]]. It's a fairly simple tree (three brothers, two of whom have daughters), but by the time you learn who the third brother is, you'd be forgiven for thinking ''everybody'''s related to the Emperor somehow.
* There's a massive, full-game sidequest in ''VideoGame/BatenKaitos'' where you have to get every member of a dying old man's family to sign their name on their place on his family tree. The man had five wives and had children with all but one (who he adopted a single child with), many of whom had more children. There's around 50 [=NPCs=] on the tree.
* ''VideoGame/MetalGearSolid'' features {{clon|ingBlues}}e [[EvilTwin sons]] of [[LukeIAmYourFather Big Boss]] SeparatedAtBirth, [[GrandTheftMe one of whom dies and possesses the arm of another man who had it transplanted onto him after his death]], and it turns out [[spoiler: Eva was Snake's surrogate mother all along]] A small family tree, but it gets honorable mention because of how insane it actually is.
** Also, every single mook in ''VideoGame/MetalGearSolid 1'' is related to the Snakes due to genetic engineering!
** Liquid also mentions how the Gulf War Syndrome was caused by prototypical gene therapy experiments; therefore, Gulf Veterans and their children are ''also'' related to the Snakes.
** Also Solidus, the third brother, who became President.
*** And Solidus is [[spoiler: Raiden's adoptive father]].
** Trying to detail the relationships of every character in the ''Metal Gear'' series forms an incomprehensible mess which ultimately connects every named character in the series.
* ''VideoGame/ChronoTrigger'' has this, and is only exacerbated by ''VideoGame/ChronoCross'':
** Marle is part of the Guardia royal family. During her travels she meets Doan, her descendant from the BadFuture, and Ayla and Kino, her ancestors from [[OneMillionBC Sixty-Five Million BC]]. She also has a pendant [[spoiler:identical to Schala's, which implies a connection to the Zeal royal family, making Schala and Janus possible relatives as well]].
*** And at least one ending suggests that Frog[[spoiler:/Glenn]] may be her ancestor as well.
** Lucca helped revive Robo, and her research eventually culminates in the supercomputer [=FATE=] [[spoiler:a.k.a. Lynx]], making her their mother in a figurative sense. She also adopted Kid, [[spoiler:Schala's daughter-clone created while Schala was merged with Lavos in the form of the Time Devourer]].
** To top everything off, all humans are [[spoiler:descended from Lavos in multiple senses, as the parasite's planetfall wiped out humanity's competition in prehistory, and contact with the Frozen Flame accelerated human evolution and imbued the magical powers that led to Zeal]].
* ''VideoGame/TheSims2'' premade neighborhood Strangetown comes with a rather complex family tree. A dead Sim, Glarn Curious, was originally married to Glabe Curious (another theory is that she is his sister). He was abducted by aliens and [[MisterSeahorse impregnated]] by Pollination Technician 9. After giving birth to twins, Glarn left Glabe and married Kitty Hogleg. They had four kids, and the oldest (Jenny) ended up marrying and having children with Pollination Technician 9 when he crash landed on Earth...
** It gets worse with the sequels. In ''The Sims 2'' for PSP, Jenny and the Curious brothers get a new cousin out of nowhere named Sinjin Balani and Pascal Curious gave birth to his alien child, Tycho. In ''The Sims 3: Ambitions'', the family tree is expanded again with Notzo Curious and Zo Curious' parents being revealed. [[http://images1.wikia.nocookie.net/sims/images/6/60/PollyFamTree.png Here is the family tree for those interested]].
** Thanks to Story Progression, it can even happen randomly to players. The mechanic will pair up any sims Young Adult or older as long as they're not directly related. Since the game is only able to keep track of so many relationship taboos, which often leads to [[KissingCousins second cousin marriages]] and the like. Sims can also marry their ex-aunts and uncles (since the game only counts them as related if they're married to a relative) and become their cousins' step-parent. Their new child will be the cousin/stepchild's half-sibling/nephew/niece. To further convolute things, the cousin/stepchild can go on to marry the step-parent/cousins nephew or niece. To complete the circle of fuckery, their child can marry and have kids with the ghost of one of their ancestors. Does your head hurt yet?
** What makes this even worse is that, thanks to mods, you can even make Sims have children [[IncestIsRelative with their siblings]] ''[[IncestIsRelative or]]'' [[ParentalIncest their parents]].
* Although one might not count it as a "family" tree, the sheer number of people in the ''Franchise/KingdomHearts'' series who are, were, pretended to be, or were semi-kinda-possessed-by-fake Ansem is staggering. [[spoiler:Master Xehanort took over Terra's body, becoming the character known as "Xehanort." He pretended to be Ansem, and the Ansem in the first game ("Ansem, Seeker of Darkness") is Xehanort's Heartless. The antagonist of ''KHII'' (Xemnas, an anagram of Ansem with an X added in) is Xehanort's Nobody. Also, Riku (who was possessed for a time and even had his body stolen by ASOD in the first game), using ASOD's powers, took on the form and name of that Ansem. The actual real Ansem (Ansem the Wise, the former ruler of Radiant Garden) is first introduced in ''Chain of Memories'' as "[=DiZ=]" (short for "Darkness in Zero") and his true identity is discovered near the end of ''II''.]]
** Not to mention all the many Soras.
*** To clarify, aside of Roxas (Sora's Nobody), there's [[spoiler:Xion from ''Days'', a Replica of Roxas made from Sora's memories created by Xemnas to use as a fail-safe in case Sora and Roxas proved to be useless to Organization XIII's goals; in essence, she's an OppositeSexClone of Sora/Roxas]]. ''Birth by Sleep'' gives us Ventus, who not only looks like Roxas ([[{{Prequel}} or rather]], Roxas resembles him), but [[spoiler:whose heart dwells inside of Sora's due to certain circumstances taking place at the end of the game. Additionally, Vanitas, his EnemyWithout, shares Sora's face due to the heart of a newborn Sora offering to connect his heart to Ven's after the forcible creation of Vanitas (thanks to Master Xehanort) left Ven temporarily comatose]].
** ''[[VideoGame/KingdomHearts3D 3D]]'' has taken this trope and ran with it to ''extreme'' levels of litigiousness. [[spoiler:Master Xehanort, BackFromTheDead, is gathering together a new Organization XIII. Who are among its ranks? ''Thirteen Xehanorts brought together across various timelines.'' A younger incarnation Master Xehanort (known better to players as the [[BonusBoss Unknown/Mysterious Figure]] from ''BBS'' and co-existing alongside his older self) was tasked by Ansem, Seeker of Darkness (who was able to time travel due to his lack of a body) with gathering thirteen incarnations of Xehanort. Aside of Master Xehanort, Young Xehanort, Xemnas, and Ansem, Xigbar and Saïx (and not their original personas, Braig and Isa, strangely enough) are revealed to be Xehanorts as well, having been infused with a part of Master Xehanort's heart and gradually turning ''into'' Xehanort (slowly adopting features of his such as golden eyes and pointed ears). Additionally, the plan was to turn ''Sora'' into the final member of this group (luckily, it was thwarted by a BigDamnHeroes moment from Lea, Axel's original identity), and the original plan for the first Organization XIII was to use the other Nobodies as vessels for Xehanort's heart.]]
* ''VideoGame/CrusaderKings.'' In a game about feudal Europe and its dynasties where alliances [[ArrangedMarriage are sealed by marriage]], this trope naturally follows. In the sequel, Zoroastrian rulers add in dynastic inbreeding to the mix, just to mess things up more.
* ''Franchise/DynastyWarriors'' (taking after the novel and history) has as playable characters: The Sun family (father Jian, sons Ce and Quan, daughter Shangxiang), Quan's concubine Lianshi, and Ce's wife Da Qiao, whose sister Xiao Qiao is married to Sun Ce's sworn brother Zhou Yu, making them brothers-in-law. Sun Shangxiang is married (at least briefly) to Shu's leader Liu Bei, who has a son from another marriage Liu Shan, who is married to Xingcai, the daughter of one of Liu Bei's sworn brothers Zhang Fei.
** Mercifully the direct playable character family link ends there for the game; in the novel and history it continues with Xingcai's mother being the niece of Xiahou Ba, whose father Xiahou Yuan is cousins with Xiahou Dun and Wei leader Cao Cao. Cao Cao in turn has his own cousin, Cao Ren, and a son Cao Pi whose wife Zhen Ji was originally married to one of Yuan Shao's sons. Cao Ren has a daughter who marries another one of Sun Jian's sons bringing us full circle.
* Seen quite a bit in the ''VideoGame/DarkParables'', where many of the characters from classic fairy tales are either {{Composite Character}}s or else related to one another in ways that their original stories did not include. The absolute epicenter of the family tree earthquake is Literature/TheFrogPrince, owing to the fact that he was married five times in this universe. The longer the series goes on, the more connections are found between the characters. Among the highlights: [[spoiler:His first wife, Ivy, was the sister of Briar Rose (SleepingBeauty). Another wife was Naida, who was the sister of Literature/TheLittleMermaid. His fifth wife is [[Literature/SnowWhiteAndTheSevenDwarfs Snow White]], who is also Literature/TheSnowQueen, and whose twin brother [[Literature/SnowWhiteAndRoseRed Ross Red]] is engaged to Literature/{{Rapunzel}}. Snow White is also the mother of the Frog Prince's only child, Prince Gwyn, who is good friends with [[Literature/TheSnowQueen Kai and Gerda]], and Gerda is a direct descendant of [[Literature/HanselAndGretel Hansel]]. Meanwhile, Briar Rose belongs to a badass group of warrior women called the [[Literature/LittleRedRidingHood Red Riding Hood Sisters]]; its members also include Teresa, who is another sister of the Little Mermaid, and Brianne, who turns out to be [[Literature/BeautyAndTheBeast Beauty]], and Emma, who is engaged to [[Literature/JackAndTheBeanstalk Jack]] (the beanstalk guy). Emma is also a descendant of the girl who became queen because Literature/{{Rumpelstiltskin}} helped her spin straw into gold]]. Players may wish to draw up a chart... especially since the series is nowhere near finished.
[[/folder]]

[[folder:Visual Novels]]
* ''VisualNovel/PrincessWaltz''. It's hard to get into too much detail without major spoilers, but let's give it a shot. A man and a woman (let's call them [[AliceAndBob Bob and Alice]]) got married, and had a son, Charlie. Alice's sister Denise had two daughters, Emily and Faye. When the second generation grew up, Emily married Charlie (her cousin), and had a son, Greg. However, Faye seduced Charlie as well, and had a daughter, Hannah. When Greg and Hannah grew up, [[spoiler:they became the protagonist of the game and his primary love interest, Arata and Chris]]. Interestingly, [[ElephantInTheLivingRoom no one ever mentions this]].
* In ''VisualNovel/UminekoWhenTheyCry'', [[spoiler:Kinzo and Beatrice I had a daughter, Beatrice II. Kinzo then [[{{Squick}} had another child]] [[ParentalIncest with Beatrice II]]: Sayo Yasuda, also known as Shannon/Kanon/Beatrice III. Now realize that Sayo Yasuda is in a relationship with three of Kinzo's grandchildren, and how ''those'' guys are actually connected in the family tree]]. Yep.
* In the backstory of ''VisualNovel/SchoolDays'', thanks to the exploits of Makoto's father Tomaru, practically all the characters in the expanded universe are related to one another. As shown by [[http://overflow.wikia.com/wiki/Tomaru_Sawagoe this page]], Tamaru has someone who is his daughter, granddaughter, great-granddaughter, half-great grandniece ''and'' lover.
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/TheInexplicableAdventuresOfBob,'' Bob's adopted daughter Molly is a pink furry monster who was spontaneously generated in a lab accident. Molly shares a tiny bit of genetic material with Bob's girlfriend Jean, making Jean her biological mother "just a little bit." Molly lived for a time with Jean's Uncle Cestus Poole, whom Molly addresses as Uncle Cess. Molly built a sentient robot named Roofus, who regards her as his mother, which makes Bob and Jean his grandparents. Roofus now lives on another planet, being raised by Bob's alien friend Voluptua, whom Molly addresses as "Auntie Voluptua." Molly also has a genetically identical cloned "sister" named Galatea, grown by Dean Martin (no, no ''that'' Dean Martin), who is her de facto father. She is also Jean's biological daughter "just a little bit" just as Molly is. Galatea addresses Bob as "Uncle." Molly regards Roofus as Galatea's nephew.
** Molly now also has a ''second'' clone sister named Djali ("Jolly"), short for Djaliana, who was grown by Galatea. Jolly looks like her sisters except for being [[{{Kaiju}} a couple of hundred feet tall.]] Despite being grown by Galatea, she still considers Jean her mother.
* ''Webcomic/KevinAndKell'' stars a wolf and a ''rabbit'', so if you get to thinking about family trees you'd probably figure on the rabbit being the cause of the giant, twisted family tree. But the growing family tree was explicitly pointed out prior to any major revelation about the rabbit's side of things. At that point there was Kevin (the rabbit) and his wife Kell (the wolf), each of whom had a kid from a previous marriage, plus Kell's brother who got married to a major supporting character and turned out to be [[spoiler:the father of another major supporting character]], not to mention some budding romances and cloning going around, and... maybe you should [[http://www.kevinandkell.com/2002/kk0526.html look for yourself]].
** Note that's out of date, currently we have George Fennec married to a human-turned-rabbit (who is an alternate reality of Kevin's sister) who has a human son, Lindesfarne married her batty fiance, plus add in Kevin's Mother marrying their world's version of DB Cooper (Yes, really), who's a squirrel.
*** AND Fiona Fenec is dating Rudy Dewclaw, and since wolves mate for life...
** Also, there's cloning.
* Ellen Dunkel from ''Webcomic/ElGoonishShive'' is either an OppositeSexClone of Elliot or a magical curse given human form, depending on how you think about it. This leads to [[http://img12.imageshack.us/img12/4568/youmightbearedneck.png confusion]] as to who can be considered her parents.
** Ellen has three fathers (none adoptive) and four mothers (two adoptive), and one of her mothers is her brother. That's not including the crazy immortal and an alternate version of her brother, which would put her at four fathers and five mothers. Beat that.
** Grace on the subject of Ellen: "Elliot's the mommy, the [[ArtifactOfDoom diamond]] was the doctor who delivered Ellen, and Tedd's the daddy! Wait a minute... If Tedd's the daddy... Oh my gosh! I'm a mommy!"
** Grace is a hybrid clone (with 4 sources of DNA), and considers the other hybrid clones from the same lab her siblings. Her "grandfather" replaced some of the DNA she was supposed to be cloned from with that of his dead daughter--Grace's "mother" (and namesake).
* Several characters (specifically, [[spoiler: ''most of the human characters introduced'']]) in ''Webcomic/{{Homestuck}}'' belong to a ridiculously [[MindScrew mind-screwy]] family tree, thanks to a combination of cloning, {{Stable Time Loop}}s, and more than one TemporalParadox, all of which in turn contribute one of the most convoluted cases of MyOwnGrampa ''ever''.
** It gets even worse. [[spoiler: John and Jade are the son and daughter of their (adoptive) Grandma and Grandpa, respectively, who were raised as brother and sister despite not actually being related. Fortunately incest is averted by the whole cloning thing.]]
*** Honestly, it's even worse than that. [[spoiler: Since John's the one responsible for creating them all, he could technically be said to be his own father (as well as the father of Rose, Dave, and Jade) AND his own great-grandfather, and his adoptive father is really his half-brother. Dave's Bro is also Dave's father, and Jade's Grandfather is really her father as well. Rose's mother is the only one who really IS what she seems to be, though Rose herself could theoretically be said to be the mother of Bec (Jade's demon dog), since she's the one who provided half the DNA code (via her journal) to create him. And the person who actually created Bec from that code was Draconian Dignitary. Has your head exploded yet?]]
** A family tree for the humans can be found [[http://img64.imageshack.us/img64/5629/homestuckfamilytree.png here]], although it does not include everything mentioned so far in the comic, and it leaves out the entire [[spoiler: Post-Scratch Universe]]. Note that [[spoiler: John's Dad is the ''only'' person in that family tree who is the result of his parents having sex. And the tree doesn't even mention the growing romance between John's Dad and Rose's Mom...]])
** Vriska sums it up best:
-->'''AG:''' ::::/
** Not that she has any reason to talk, since the trolls are technically ''all'' part of one Tangled Family Tree as a natural result of their BizarreAlienBiology. Not to mention that the troll players ''also'' fall under MyOwnGrampa.
*** Speaking of trolls, ''it gets worse''. Although it hasn't been outright stated yet, it is very heavily implied that [[spoiler: Betty Crocker is actually the Troll Empress, who is Feferi's Ancestor. Although there is still BizarreAlienBiology and MyOwnGrampa going around, it's very likely that Feferi can be considered John and Jade's great-aunt by adoption]].
*** We can even add [[spoiler: [[DemonicDummy Lil' Cal]], [[ManipulativeBastard Doc Scratch]], and [[EldritchAbomination Lord English]]]] into this. [[spoiler: Lil' Cal was created in Dave's dreamspace by Gamzee. He later ends up in the Troll's universe and is used to create Doc Scratch (who also had genetic code provided by Gamzee, Vriska, Terezi, Tavros, and Aradia) by the Black Queen/Snowman. Finally, Lord English bursts from Doc Scratch's corpse at the end of the universe because [[PhraseCatcher he was already there]].]] Wanna make things worse? [[spoiler: Doc Scratch can be considered the adoptive father to Aradia's Ancestor, and acted as a guardian for Kanaya.]] This tree loops on itself.
** And now as of Act 6 [[spoiler: we have an AlternateUniverse where the human ectobiological parents are now the children, and vice versa.]] Just to make things more confusing.
** ''Then'' we find out that Gamzee was the adoptive parent of [[spoiler:Calliope/Caliborn, the cherub that would become Lord English]]. Basically, ''everyone'' with a name is related.
* Though it is (so far) without time travel, the Val'Sarghress family tree in ''Webcomic/{{Drowtales}}'' is quickly becoming this with revelations about [[spoiler:Kalki Nidraa'chal]], who turns out to be [[spoiler:the child of Snadhya'rune Vel'Sharen and Mel'arnach Val'Sarghress ([[FamilyRelationshipSwitcheroo who is Ariel's real mother]]) who are [[HomosexualReproduction both women]], and technically makes Kalki Ariel's half-sister]]. And that doesn't even touch on the fact that [[spoiler:Ariel's father is a dark-elf turned ''giant spider'' named Zhor who's been hinted to have some connection to Diva'ratika, possibly making ''another'' connection between the two families]] or how [[spoiler:Diva'ratrika]] is technically Ariel's [[spoiler:step-grandmother or the equivalent thereof, since drow do not get married but her daughter Snadhya'rune is the lover of Ariel's mother Mel'arnach]].
* In [[{{Franchise/Buildingverse}} the world]] of the MassiveMultiplayerCrossover FanWebcomic ''Webcomic/{{Roommates}}'' and its SpinOff ''Webcomic/GirlsNextDoor'' every [[WitchSpecies magical]] [[TheFairFolk being]] from every fanon ever is related. This is as chaotic and [[MindScrew weird]] as you might guess and some even have [[TimeMaster time magic]] to boot. Someone theorized in the comment section once that the magic family tree must be the unholy bastard child of an elaborate Celtic knot and the TimeyWimeyBall. Lampshaded by [[http://asherhyder.deviantart.com/art/Roommates-88-Relativity-119779422 this]] page:
-->'''Sarah''': Is there anyone in the magical community you're NOT related to?
-->'''Jareth''': My dear, why do you think we marry mortals?
** The other SpinOff ''Webcomic/DownTheStreet'' seems to do this with [[OurVampiresAreDifferent vampires]].
** And yet another, the HoYay one about the Valjean/Javert ship titled ''Webcomic/{{Superintendent}}'' with the characters of Creator/VictorHugo.
* ''WebComic/DragonBallMultiverse'': Thanks to U16 Vegetto, the Son and Briefs families are now one.
* The clan in ''Webcomic/FarToTheNorth'' features the main character's mother, her older siblings, their respective spouses, and their many children all living together under the same roof. Keeping track of how everyone is related almost requires a chart.
* ''Webcomic/OffWhite'': The wolves [[spoiler: Raigho, Hati, and Iki/Sköll]] relationships with each other are very complicated. [[spoiler: Hati, Sköll's brother since the dawn of time, was reincarnated into Raigho's mother's litter, making Raigho Hati's blood brother. When Raigho became a adult, he adopted Iki/Sköll. So Hati is both Iki/Sköll's brother and uncle.]] It's weird, but no actual incest is involved.
* In ''Webcomic/GrrlPower'', Sydney has a crush on Tony, a guy who frequents the comic shop she owns. She's initially disheartened when he comes into the shop with an extremely attractive woman... who turns out to be Olivia, his sister/cousin. Apparently, their father [[TwinThreesomeFantasy scored with a pair of twins]] [[NoodleIncident at a college party (or something)]]. Sydney is thus very pleased to find out that Olivia won't be competition.
[[/folder]]

[[folder:Web Original]]
* The majority of the cast in ''Literature/ThaliasMusings''. It's the Greek Pantheon.
* Creative (ab)use of the relationship settings on Website/{{Facebook}} can result in these.
* In [[http://soulsrpg.com/ 'Souls RPG]], the Lykoi and de le Poer families are quite tangled and intricate.
* It's hard to explain Bunny and Madgie's family tree but it is clear it is this trope, seeing that the two have so many relatives, it is hard to tell who is related to which, as well as the fact that they are so numerous they are scattered throughout the world, coupled with the fact that some of them are all younger than Madgie.
[[/folder]]

[[folder:Western Animation]]
* ''Franchise/ScoobyDoo'', over various spinoffs, has introduced enough cousins, uncles, aunts, nephews, and even ''siblings'' of Shaggy, Scooby, Fred, Daphne, and Velma (most of them appearing only once and then never to be seen again) that they probably fall under this trope.
%%* ''WesternAnimation/{{Futurama}}'' brings us Fry's family tree, [[http://theinfosphere.org/Fry_family_tree seen here]].
* In ''WesternAnimation/TheOblongs'', we are given a glimpse of the Oblong family tree. Given that nearly the entire current generation is made up of people with deformities and/or missing limbs, it is understandably messed up, but the fact that some of the family members were in Hiroshima around the time of the A-Bomb's detonation, and were originally traced back to carny folk is quickly eclipsed by the presence of uncle Kiki, A MONKEY.
-->"As far back as I can trace, my relatives were carnival folk, Who were touring a place called "Hiroshima" in the summer of 1945. After that because of their lack of hair and skin they mostly married each other. And here I am!"
* ''WesternAnimation/TheClevelandShow'' is about a fairly typical blended family (mother of two marries a father of one), but in the final episode, Donna's ex-husband Robert [[LoveFatherLoveSon hooks up with]] her mother Dee Dee and the pair adopt a Chinese child, greatly upsetting the family. Rollo is especially frustrated because he's supposed to make a family tree for school, and now he has to figure out a way to make his grandma his stepmom, his dad a grandparent, and add an uncle his own age. Eventually he gets so annoyed that he rips it up.
* [[WesternAnimation/FamilyGuy The Griffin family]] itself might count as this. Besides the standard nuclear family of Peter, his wife Lois, and their three children, [[RememberTheNewGuy countless relatives of his]] (his brother Thaddeus, sister Karen, broster, and vestigial twin Chip included) have come and gone over the years, especially ancestors who only appear in cutaway gags. One of his ancestors, Nate Griffin, even had children with one of Lois's ancestors, Lois Laura Bush Lynne Cheney Pewterschmidt, which would somehow make Peter and Lois KissingCousins. There have also been mentions of them having other children that either died in infancy, were stillborn, or miscarried (albeit mostly in cutaway gags). We're not even getting into [[MisterSeahorse the kids]] [[HomosexualReproduction Stewie had with Brian]] in "Stewie is Enceinte" (who themselves are half-siblings of [[HalfHumanHybrid Brian's son Dylan]]), [[CloningBlues his clones]], his half-brother Bertram (and God knows how many other half-siblings he might have out there after Peter's mishap at the sperm bank), ''or'' his ancestor Leonardo Da Vinci. (To top it all off, Stewie became [[MyOwnGrampa his own ancestor]] in "The Big Bang Theory" in order to increase his chances of being born after Bertram killed Leonardo.) [[ArsonMurderAndJaywalking Did we mention Peter's biological father is Mickey McFinnigan?]]
** How about Peter and Lois being reincarnations of Quahog's founder Griffin Peterson and his true love, Lady Redbush? Yeah, well, it should also be noted that they each married a (possible) previous incarnation of [[ParentalIncest Meg and Stewie]] before finding each other again. Oh, and don't forget the kids Lois had with Quagmire in an alternate timeline.
[[/folder]]

[[folder:Real Life]]
%%* [[http://www.newser.com/story/87448/im-in-love-with-my-grandson-and-were-having-a-baby-new-idea-magazine-yahooxtra-lifestyle.html This]] real-life example of IncestIsRelative.
* The family tree of the Julio-Claudian dynasty of the early Roman Empire is just about the closest thing to a real life Tangled Family Tree as you're going to find, as many very confused first-time viewers of Creator/TheBBC miniseries ''Series/IClaudius'' have discovered. [[http://en.wikipedia.org/wiki/Julio-Claudian_family_tree Here's]] a rendering of that family tree. (Some people have discovered that having a copy of the Julio-Claudian family tree at one's side greatly helps a viewer grasp who's who and what's what while watching ''Series/IClaudius''. Others avoid looking at the family tree at all, as it contains spoilers.)
** For example: UsefulNotes/{{Caligula}} Caesar's paternal grandfather, Drusus, was the son of Augustus's second wife Livia by her first marriage. His paternal grandmother, Antonia, was the daughter of Mark Antony and Augustus's sister Octavia. His maternal grandmother was Augustus's daughter of his first marriage, Julia, who married Augustus's friend, General Agrippa.
** [[http://en.wikipedia.org/wiki/Agrippina_the_Younger Agrippina the Younger]], was (allegedly) the lover of Emperor UsefulNotes/{{Caligula}}, despite being his [[BrotherSisterIncest sister]], the wife of Emperor Claudius, despite being his niece, and the mother of Emperor UsefulNotes/{{Nero}}, and was also rumored to have had ParentalIncest with him, before the two had a falling out over a woman and he had her killed. BigScrewedUpFamily doesn't even begin to cover it.
** Also not helped by the Romans' love of adopting nephews as sons, [[ReallyGetsAround sleeping around as much as the Gods]], and giving all of their daughters the same name.
* The Julio-Claudians were pikers compared to a lot of European dynasties a few hundred years ago. The number of times people married their first cousins to reaffirm long-standing alliances or some such was absolutely unbelievable. Even in the modern day, it still happens - Queen Elizabeth II and Prince Philip are both second cousins once removed and third cousins via different paths.
** The worst example historically is probably [[http://en.wikipedia.org/wiki/Alfonso_XII_of_Spain Alfonso XII of Spain]] whose grandfathers were brothers who each married their own nieces.[[note]] As the Wikipedia article notes, though, it is speculated that Alfonso XII's father was not his mother's husband/second cousin.[[/note]] Instead of the usual 24 great- and great-great-grandparents, he had 10. Admittedly, that's not directly a Tangled Family Tree, but when it carries on for a while (and it did, for centuries) it can get ludicrously tangled.
** All that that is before you consider that these people were often all rulers in different nations. Just because he's your brother and your cousin doesn't mean that you can't go to war with him, right? Which makes the UsefulNotes/ThirtyYearsWar (aka, the bloodiest European war pre-WWI) the second-biggest family feud of all time.
** The [[http://en.wikipedia.org/wiki/File:Carlos_segundo80.png family tree]] of [[http://en.wikipedia.org/wiki/Charles_II_of_Spain Charles II of Spain]] is also incredibly tangled. In case you don't want to work it out, that means a grand total of ''eight'' separate genomes introduced over the course of seven generations and at least three cases of men marrying their nieces. Not only that, but Joanna of Castile, a.k.a. "Crazy Jane", is most of his great^5 and 6 grandmothers, when it'd be normal to have 16 and 32, respectively. Hence him being a literal deformed moron, hence him being unable to produce children (they actually tried, with two wives that were merely second cousins, but the man was literally too malformed to breed), hence the SuccessionCrisis, hence the UsefulNotes/WarOfTheSpanishSuccession, or the ''third''-biggest family feud of all time.\\
UsefulNotes/LouisXIV of France and Leopold I of Austria both had claims to the Spanish throne through Charles II's grandfather, by way of their mothers and their wives. Problem was, one had a mother who was the other's mother's older sister, the other had a wife who was the other's wife's older sister, and nobody could figure out which trumped which. When the third candidate (six year old [[http://en.wikipedia.org/wiki/Joseph_Ferdinand_of_Bavaria,_Prince_of_Asturias Joseph Ferdinand/José Fernando of Bavaria]]) died, the French king moved to have his grandson crowned, and the Austrian emperor moved to have his son crowned. The rest of Europe was terrified of either power gaining control of the Spanish empire, and moved to stop them both. Hence, The War Of Spanish Succession.
*** Philip of Castille[[note]](died 1506)[[/note]] and Joanna of Castille[[note]](died 1555)[[/note]] together were ''both'' 3x-Great grandparents ''and'' 5x-Great-grandparents to Charles II, and provided about 40.6% of his[[note]](born 1661)[[/note]] genes. That shouldn't work! And frankly didn't!
*** Charles II also had [[http://en.wikipedia.org/wiki/Syphilis,_congenital congenital syphilis]] (his father was infected through sex with prostitutes, then transmitted it to his wife, who in turn passed the disease on to her unborn son), which is known to cause severe birth defects and genetic mutation. This may well have been the first ''new'' genetic information introduced in generations. Think of it as adding a little raw sewage to a gene pool filled with stagnant swamp water.
** And Charles II is just the most severe case in his dynasty. Pick a Habsburg. ''Any'' Habsburg. There's a reason there's a Wikipedia article on the Habsburg chin. The Hapsburg case is one of wanting to keep it "all in the family." Unlike many of Europe's dynasties, they came by the vast majority of their titles through lucky inheritances (having come to power after the black plague devastated most of the noble houses of Europe) rather than war, and they didn't want to lose any of them the same way they had earned them. As has been noted, this ultimately produced a literal genetic recipe for disaster. The Hapsburg Chin (or Lip) went from a family trait of a larger than normal lower jaw to a facial deformity so severe that Charles II could barely speak and couldn't chew.
** You would think that if you had a grandmother called Juana The Mad you would know better than to marry your double first cousin and later your own niece (daughter of your sister by another first cousin!) but not if you are Philip II of Spain. And that of course was why Philip was the LAST sane and intelligent King of the Spanish Hapsburg line.
*** His ''daughters'' by the French Elisabeth de Valois were beautiful, sane and highly intelligent - in contrast to the two sons he bred with the above mentioned cousin and niece. But did he notice and draw the obvious lesson? Heck no!
* OlderThanDirt: Any given {{Ancient Egypt}}ian dynasty, whose RoyalBlood was traditionally "preserved" via so much incest that it gave Pharoah Tutankhamun a club foot and a cleft palate, and was probably the reason he had no surviving offspring.
** According to recent DNA studies Tut was the offspring of a full brother/sister marriage said brother and sister being children of Amenhotep III and his non-royal wife Tiye suggesting that exogamy may actually be the source of his biological problems as the antecedent Thutmossids' only genetic problem seems to have been a bad overbite.
** The 12th Dynasty seems to consistently practices brother/sister marriage and it lasted nearly two hundred years producing seven extremely able and successful kings and finally ending due to a derth of male heirs. It all depends on how sound the genetic inheritance is to start with.
* The Greek Ptolemaic dynasty of Egypt (founded by Ptolemy, who was one of Alexander the Great's Generals) is so knotted and twisted that it almost defies description. [[http://web.archive.org/web/20060701120643/www.geocities.com/christopherjbennett/ This website makes a brave effort.]] [[http://en.wikipedia.org/wiki/Ptolemy_VIII Ptolemy VIII Tryphon]] and his wife (and double-niece) [[http://en.wikipedia.org/wiki/Cleopatra_III Cleopatra III]] produced five children: [[http://en.wikipedia.org/wiki/Cleopatra_IV_of_Egypt Cleopatra IV]], [[http://en.wikipedia.org/wiki/Ptolemy_IX Ptolemy IX]], [[http://en.wikipedia.org/wiki/Cleopatra_V_Tryphaena Tryphaena]], [[http://en.wikipedia.org/wiki/Cleopatra_Selene_I Cleopatra Selene]], and [[http://en.wikipedia.org/wiki/Ptolemy_X_Alexander_I Ptolemy X Alexander I]]. Ptolemy IX secretly married his sister Cleopatra IV, but their mother forced them to divorce (they'd already produced two sons, [[http://en.wikipedia.org/wiki/Ptolemy_XII_Auletes Ptolemy XII Auletes]] and [[http://en.wikipedia.org/wiki/Ptolemy_of_Cyprus Ptolemy of Cyprus]]). Cleopatra IV then married their cousin [[http://en.wikipedia.org/wiki/Antiochus_IX_Cyzicenus Antiochos IX of Syria]], and had another son with him, [[http://en.wikipedia.org/wiki/Antiochus_X_Eusebes Antiochos X]]. She was then murdered on the orders of her sister Tryphaena (who was in turn executed by Antiochos IX). Her brother/ex-husband Ptolemy IX meanwhile married his other sister, Cleopatra Selene, by whom he had a daughter, [[http://en.wikipedia.org/wiki/Berenice_III_of_Egypt Berenike III]]. He was expelled by Egypt by their brother, Ptolemy X Alexander I, who then married Cleopatra Selene himself (they had a son named [[http://en.wikipedia.org/wiki/Ptolemy_XI_Alexander_II Ptolemy XI Alexander II]]). After they divorced, Cleopatra Selene married three successive kings of Syria, becoming history's only known quintuple queen: [[http://en.wikipedia.org/wiki/Antiochus_VIII_Grypus Antiochos VIII]] (widower of her sister Tryphaena), [[http://en.wikipedia.org/wiki/Antiochus_IX_Cyzicenus Antiochos IX]] (widower of her other sister, Cleopatra IV) and finally [[http://en.wikipedia.org/wiki/Antiochus_X_Eusebes Antiochos X]], her own nephew, by whom she had two sons. Ptolemy X Alexander I married his niece/stepdaughter, Berenike III, and had a daughter by her, [[http://en.wikipedia.org/wiki/Cleopatra_V_of_Egypt Cleopatra V]]. After his death, Berenike married her half-brother/cousin/stepson, Ptolemy XI Alexander II, who had her murdered and was subsequently murdered himself. [[http://en.wikipedia.org/wiki/Ptolemy_XII_Auletes Ptolemy XII Auletes]], the son of Ptolemy IX and Cleopatra IV, became king and married his niece, Cleopatra V, by whom he was father of the famous [[http://en.wikipedia.org/wiki/Cleopatra_VII Cleopatra VII]] (she of Caesar and Mark Antony fame). This tangled web is not at all helped by the fact that all the principal players shared only about four names and have to be distinguished by Roman numeral.
** If Mark Antony had won the war, it would have gotten a lot worse. For example, the [[http://en.wikipedia.org/wiki/Donations_of_Alexandria Donations of Alexandria]] would have divided the Roman holdings in the Eastern Mediterranean (and parts of Armenia and Persia conquered by Mark Antony in the name of Egypt) into various kingdoms, each with one of Mark and Cleo's children as King or Queen. In Alexandria, Cleo would have been crowned "High Queen and Queen of Egypt". Her son by Caesar, Ptolemy Caesar (better known by his Latin nickname [[http://en.wikipedia.org/wiki/Caesarion Ceasarion]], meaning "Little Caesar"), would be crowned "High King, King of Egypt, heir to Caesar (who was by that point raised to the status of living god), Dictator of Rome". You just ''know'' the various lesser kings and queens would get into all kinds of family feuds and incestuous marriages like later day European royalty. Potentially even Twincest since Alexander Helios ([[MeaningfulName Alexander Sun]]) and Cleopatra Selene II ([[ThemeNaming Cleopatra Moon II]]) were twins, and both included in the land grab. However it gets really interesting when you consider that the King and Queen of Egypt, traditionally ruled together, were related, and [[ParentalIncest married]]. So Cleo's relationship record would've gone "Brother, other Brother, Caesar, Mark Antony, Son."
* Both Queen Victoria of Britain, and Christian IX of Denmark had a lot of children that were married off to the royalty of Europe according to custom. During UsefulNotes/WorldWarI, every monarch in Europe, even the rulers of minor nations like Romania, and Greece, were the grandchild of Vicky on one side, and Chris on the other, making them both maternal and paternal cousins. (Victor Emmanuel III of Italy and Franz Joseph of Austria-Hungary being among the only exceptions, although the latter, as a Habsburg, had a tangled family tree of his own.) Both the Russian Tsar and the German Kaiser spoke English as their first language, and the Swiss press at the time called it "the cousins' war". Surreal.
** [[http://en.wikipedia.org/wiki/File:Tsar_Nicholas_II_%26_King_George_V.JPG Here]] is a photo of British King George V, and his double cousin Tsar Nicholas II of Russia both wearing German military uniforms together in Berlin before the war. Good luck figuring out which is which. They look enough alike to be twins and have the same taste in facial hair.
** Even more surreal when you realise that through Imperialism, they controlled anywhere between 75% and 90% of the world's landmass, making them also the most successful family in human history.
** Despite the close relationships and often being in close communication, they quite frequently hated each other. To a substantial degree, World War One started because the English royals sneered down their noses at Kaiser Wilhelm, and he was desperate to be loved while also resenting them. Yes, World War One takes the title for "biggest family feud of all time," even if you discount the Americans and the French.
*** There was also the fact that Wilhelm really didn't grasp that his cousin George didn't control the British government. He was convinced that King George V wouldn't allow the dispute to come to war, not understanding that George didn't have a say in the matter.
** And then there's the fact that Franz Joseph's great-great-grandfather was Charles III of Spain, and Victor Emmanuel's great-great-grandfather was brother to Franz Joseph's grandfather. For extra fun, the families of Christian IX and Victoria married several times; most notably, a Danish prince and his wife (Victoria's granddaughter), who became the first King and Queen of Norway.
* The Rothschild banking family, said to be so rich they financed both sides of every war in the 19th century, practiced incestuous marriage, motivated by the fact that marrying outside the family would mean the family fortune would be split in between different lines through inheritance, dowries and the like. Several generations of Cousin/Cousin, and in one case, Uncle/Niece marriages followed. They have since abandoned this practice (doctor's orders). Also, they were right. The family fortune dried up after they stopped the incest.
** Not only that, but one of the original branches of the family died out, and several descendant branches have been in feuds with each other. While still wealthy, the Rothschilds' fortunes suffered greatly in both world wars, and they are far less wealthy than they used to be.
* Duke William of Normandy (also called William the Bastard, because he was illegitimate) invaded England and killed King Harold Godwinson, the last Anglo-Saxon King. William was motivated by the fact that he was Edward the Confessor's cousin, and was supposedly promised it by Harold Godwinson on a stack of holy relics (Edward the Confessor was the King of England before Harold Godwinson for those paying attention). King Harold Godwinson's daughter married Prince Vladimir Monomakh of Kiev (whose own mother was the daughter of Constantine IX Monomachus of Byzantium). The Russians, assisted by large numbers of Scandinavians, invaded Byzantium in 1043. Harald Hadrada ("the Ruthless"), who later became king of Norway, joined the Byzantine army with a large following of northmen ("Varanger"), campaigned widely, and ripped out the eyes of the Byzantine emperor Michael V Kalaphates in 1042. King Harald Hadrada of Norway invaded England in 1066, on the pretext that it was promised to his family by Harthacnut whose father was Cnut The Great, Viking King of Norway, Denmark, and England (also parts of Scotland, Sweden, Ireland, and Poland) from 1018-1035. Harthacnut's mother was also Emma of Normandy, William of Normandy's grandmother. Harald Hadrada was killed by King Harold Godwinson, who was himself killed by Duke William at the Battle of Hastings, thus ending the Saxon period, and leading to centuries of French rulers on the English throne. All at a time when most people never got further than 3 miles from their birthplace.
* Charles-Maurice de Talleyrand-Perigord. Not only was he a MagnificentBastard, but he had several literal bastards (probably including the artist Eugene Delacroix), most of them with a very unsure paternity. [[http://en.wikipedia.org/wiki/Charles_Auguste_Louis_Joseph,_duc_de_Morny Charles de Morny]] a politician, stated: "[[http://en.wikipedia.org/wiki/House_of_Talleyrand-Pèrigord In our family, we are bastards from mother to son since three generations, I am a great-grand-son of a king, grand-son of a bishop, son of a queen and brother of an emperor]]". Specifically, he was great-grandson to King Louis XV of France, whose illegitimate daughter Adelaide Filleul bore a son to Talleyrand, the bishop. Said son, Joseph, Comte de Flahaut, had an affair with Hortense de Beauharnais, stepdaughter of Napoleon Bonaparte and Queen of the Netherlands, an affair which produced de Morny; de Beauharnais' legitimate son later became Emperor Napoleon III. And Charles de Morny himself had an illegitimate son: writer George Feydeau. Talleyrand's legitimate family was also quite complicated, his brothers and cousins breeding prodigiously. And Talleyrand's daughter married one of his cousins.
* UsefulNotes/GenghisKhan's Y-Chromosome is found in 0.5% of all men on earth. Makes for roughly 35,000,000 people. Guy got around.
* Some 30% of all Europeans descend from Charlemagne, making for roughly 220,000,000 people descended from a total of ten legitimate and illegitimate children who survived, married, and procreated.
* Some scientists theorize that around the same time as humans first left Africa, we were [[NightmareFuel on the brink of extinction]] with fewer than 500 individuals making up the entire human race, all of them living along the straits of Aden. Sometime after making the crossing into Arabia, they would splinter into two groups. One group would return to Africa, the other would go on to colonize the rest of the world. They cite signs of a genetic bottle-neck in the human genome as evidence, geological evidence of expanding African deserts at around the same time as a cause, and fishing tools found in fossil reefs in the region from around this time gives them the place. Also of note, Mitochondrial Eve, the last common female ancestor of all humans lived around 150,000 B.C., whereas Y-Chromosome Adam, the last common male ancestor of all humans lived around 30,000 B.C..
** It is a common misconception that Y-Chromosome Adam and Mitochondrial Eve reproduced with each other, and were the only people around at the time, or were the only people around at the time with descendants in the present day. Y-Chromosome Adam is unique because he passed his genes down through an unbroken line of male offspring. Many of his male contemporaries also are ancestors of people living today, but through lines that contain daughters, so their Y-chromosomes were not passed on (although other genes of theirs certainly were). Similarly, Mitochondrial Eve is unique because she passed her genes down through an unbroken line of female offspring. Other women were alive when she lived, but somewhere in your ancestry between you and them is a male. There is no requirement that these two people reproduced with each other, or even lived at the same time, for this to be true.
*** It should further be noted that "Adam" and "Eve" are titles, not individuals. They refer only to the last common ancestor of every ''living'' human. If some isolated tribe in the Amazon or Indonesia was completely wiped out by a sudden natural disaster, "Eve" could suddenly switch to someone who lived 20,000 years later than the previous Eve.
** Also of note, Y-Chromosome Adam lived around the same time as the "Great Leap Forward", the time when humans began developing more complex tools (bow and arrow, rafts and canoes, animal traps, etc), and making art for the first time. Therefore, it's entirely reasonable to suggest that Y-Chromosome Adam's line was more successful because they were more intelligent, and therefore either A: reacted better to dangerous situations then competing males (natural selection), or B: had more successful tribes that attracted more ladies and had more surviving children (social selection). Or both.
*** The biggest cause of the difference in time periods is simply because men can have dramatically more offspring than woman, even more so with Polygamy being much more common then Monogamy for much of human history.
* Japan, with a caste system as strong as medieval Europe, is no exception. Until the marriage between who by the time was the Prince Akihito to Empress Michiko in 1958, for the past ''millennium'' members of the Japanese Imperial House can only marry another Imperial House member, a descendant of a Heian-era nobility, or, after the Meiji Restoration, the descendants of one of the former daimyos.
** The Japanese Emperors have all been drawn from the same patrilineal dynasty (their claim to legitimacy has always been that the first emperor was the grandson of Amaterasu, the sun goddess.) There have however, been a few matrilineal dynasties. That is to say, the clan who had the most power ruled by having the Crown Prince marry the daughter of the most powerful man in that clan generation after generation, therefore ensuring that the next generation counts that clan as family, and is thus loyal to them. This goes on until the ruling clan gets overthrown by another clan. So first it's the Soga clan, then the Fujiwara, then the Taira, then the Minamoto...
* Creator/CarrieFisher went so far as to make a flow chart called "Hollywood Inbreeding 101" explaining her family tree in her one woman show ''Wishful Drinking''. This was prompted by her daughter asking Fisher if she was related to her boyfriend, a grandson of Creator/ElizabethTaylor. [[note]] She's still not entirely sure.[[/note]] Thanks to numerous marriages, she's been related to several Hollywood stars including Taylor, Eddie Fisher, Debbie Reynolds, Music/PaulSimon, and Marie [=McDonald=].
* UsefulNotes/ZacharyTaylor (12th president of The United States) was second cousins with UsefulNotes/JamesMadison (4th President of The United States) who was himself first half-cousin to UsefulNotes/GeorgeWashington (1st President of The United States), James Madison's wife Dolly Madison had a sister who married George S Washington, who was George Washington's nephew. UsefulNotes/ZacharyTaylor's fourth cousin was [[UsefulNotes/TheAmericanCivilWar Robert E. Lee]] [[note]] Lee married Mary Anna Randolph Custis, step-great-granddaughter of George Washington.[[/note]](A famous Confederate General during UsefulNotes/TheAmericanCivilWar), and UsefulNotes/JeffersonDavis (1st and only President of The Confederate States) was his son in Law. When he was president, Taylor once remarked "I'll hang every secessionist there is, starting with that son-in-law of mine." Referring of course, to Jefferson Davis.
** Other Presidents who have been related include UsefulNotes/JohnQuincyAdams (6th President of The United States) who was the son of UsefulNotes/JohnAdams (2nd President of The United States), UsefulNotes/BenjaminHarrison (23rd President of The United States) who was the Grandson of UsefulNotes/WilliamHenryHarrison (9th President of The United States), UsefulNotes/FranklinDRoosevelt [[note]]Roosevelt married his fifth cousin Eleanor Roosevelt, niece of Theodore. [[/note]](32nd President of The United States) who was the cousin of UsefulNotes/TheodoreRoosevelt (26th President of The United States), and more recently, UsefulNotes/GeorgeHWBush (41st President of The United States) and his son UsefulNotes/GeorgeWBush (43rd President of The United States)
* Inbreeding (and the related genetic hilarity that ensues) is a common riff in redneck humor, as noted by Creator/JeffFoxworthy. Some examples:
-->If your family tree does not fork, you might be a redneck.
-->If you've ever gone to a family reunion to pick up women, you might be a redneck.
* Even without incest, there can be some seriously weird relations if certain people marry other certain people. For example, if you're a guy and you just married your long-time girlfriend (making her your wife), but your divorced mother just married your wife's father, that would make your wife also your (step)sister! And then if your older sister decided to marry your wife's uncle, he'd be your uncle too, but he'd also be your brother (in-law). It's almost the opposite of Jeff Foxworthy's "redneck jokes": Your family tree does fork, it just forks so dang much it resembles a bush more than a tree!
-->'''[[WesternAnimation/TheSimpsons Homer]]''': And then our kids would look all weird and mutated!
** Also see MyOwnGrampa.
* In some cultures where polygamy is legal, some husbands try to minimize strife between co-wives by marrying women who are sisters, hence used to getting along with one another. The co-wives' respective offspring are therefore each others' half-siblings and cousins at the same time. According to [[Wiki/{{Wikipedia}} The Other Wiki]], such individuals are called three-quarter siblings.
* In secluded societies, people were prone to marry close because it was easier that way. Before modern communication and roads, many remote areas in Norway had this problem; in the valley of Setesdal, certain inherital diseases spread because of this, and in nearby Telemark, some families were as tangled as any. In one case, a farmer married his cousin because she was close. One of his daughters married her second cousin, and so on. After getting all those details straight, one family member actually mused: "it is a wonder we didn`t end up morons all of us". The family tree in question [[http://www.orgelhuset.org/en/slekt.htm looks something like this]], and is only one example of many.
* Not only are UsefulNotes/FranklinDRoosevelt and UsefulNotes/TheodoreRoosevelt related, but Franklin happens to be the fifth cousin to his wife Eleanor's father. Furthermore, Eleanor happens to be the niece of Teddy Roosevelt. Let's just say that the Roosevelt family tree is complicated enough that they distinguish themselves as the Hyde Park branch (Franklin's side) and the Oyster Bay branch (Teddy's side). With Eleanor's marriage to Franklin serving as a bridge between the two. Here is the [[http://en.wikipedia.org/wiki/Roosevelt_family family tree]].
* In the year 2012, a California student named [=BridgeAnne=] D'Avignon completed a genealogical project that, by tracing both paternal and maternal lines, proved that forty-two of the forty-three men to become president of the United States of America are descended from UsefulNotes/KingJohnOfEngland. The only exception is UsefulNotes/MartinVanBuren, who is of Dutch ancestry instead. (Yes, UsefulNotes/BarackObama is a descendant of King John--his mom was white, remember?)
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