History RelatedInTheAdaptation / FanWorks

* In ''[[https://www.fimfiction.net/story/19341/alicorn Alicorn]]'', Rainbow Dash turns out to be [[ReallyRoyaltyReveal Celestia's daughter]]. She is ''not'' happy when she finds out.

* In the ''Manga/FoodWars]] fanfic ''[[https://www.fanfiction.net/s/11888601/1/Shokugeki-no-S%3C!--C5--%3E8Dma-Nashi-Saito-de-Ch%3C!--C5--%3EABfu Shokugeki no Sōma: Nashi Saito de Chīfu]], Soma and Mayu are twins.

** Iruka becomes Ino's uncle after he marries her aunt Hotaru.

** [[spoiler:Mildew]] used to be a Hofferson before being banished from his clan, and is Astrid's great-granduncle]].

* The ''Literature/{{Twilight}}''/''Series/{{Heroes}}'' fanfic ''[[https://www.fanfiction.net/s/5940750/1/Lightning-Strikes Lightning Strikes]]'' reveals that [[spoiler:Alice Cullen is actually the presumed-dead sister of Angela Petrelli]].

** ''Fanfic/KaguyaSamaLoveIsWarQueenOfThieves'' have two. Ai Hayasaka is the daughter of Silver Sable and Miko Iino being the younger sister of Yuriko Watanabe.
** ''Fanfic/KillLaKillTheWebOfLife'' have Hobie Brown and Tsumugu Kinagase being brothers but got separated following their parents' divorce.

** There's an implied blood relation between Kass's children and Kaneli, as one of Kass's children calls Kaneli her grandfather. If this is not just an expression children use in reference to Kaneli, that means that either Kass or his wife Amali are one of Kaneli's children.

** Princess Cadance is the daughter of Princess Amore (time travel was involved, since Amore lived over 1000 years ago).

** Flash Sentry and Indigo Zap are cousins. [[spoiler:Their ancestor is Commander Hurricane.]] Gloriosa Daisy and Timber Spruce are their second cousins, since their father Salty Sentry is the cousin of Flash's father Stalwart.

** Xenilla (Spacegodzilla) and Mothra Lea are technically half-siblings, since Xenilla was born from a mixture of Godzilla Senior's blood and Lea's mother's magic.

** Lily's mother's maiden-name was Grey. Which makes ComicBook/JeanGrey Harry's second-cousin ([[spoiler: as is Maddie Pryor is Jean's stolen-at-birth twin]]). Oh, and Lily is also [[spoiler: the new White Phoenix of the Crown, tying in the Endless]].

* ''Fanfic/CodePrime'': In the game ''Code Geass: Lost Colors'', Rai's lineage is rather vague, with the most direct relation he has to any of the characters being to [[spoiler:Kaguya, as his mother was a distane relative of the Sumeragi family.]] Here, he's revealed to be the illegitimate son of [[spoiler:Emperor Charles Zi Britannia and Sakura Kururugi, Genbu's older sister, making him a member of the Britannian Royal Family and Suzaku's paternal cousin. And while [[OlderThanTheyLook he may look like a teenager, that's because he didn't age during the seven years]] he spent in the Kamine Island Thought Elevator. Meaning he's Lelouch and Nunnally's older half-brother.]]

** Prince Blueblood and his family are blood descendants of Princess Platinum, with the most obvious sign of their heritage being their [[LargeAndInCharge tall heights]], when no such connections were apparent in canon. And while he's still Celestia's nephew, here Blueblood is explicitly stated to be adopted after Celestia discovered that his [[AristocratsAreEvil birth parents]] were [[AbusiveParents emotionally and psychologically abusing him]].

* The ''Series/BuffyTheVampireSlayer''/''Series/Charmed1998'' fic ''[[https://www.tthfanfic.org/Story-5065/Jinni+Dark+Clouds+May+Hang.htm Dark Clouds May Hang]]'' makes Xander Harris the son of Cole Turner and Phoebe Halliwelll; in the future where Wyatt turned evil, the Halliwells sent Xander back in time for his own protection while binding his magic, until Chris decides to look him up after his own conception in the past so they can start making arrangements for Cole's resurrection.

** The Devil Hand Arc reveals that Mirajane, Elfman and Lisanna are distant relatives of Angel/Sorano and Yukino, all of them being descendants of a mortal priestess that Sparda was forces to sacrifice in order to seal Temen-ni-gru.

* In ''[[https://www.tthfanfic.org/Story-27940-51/vidicon+Odd+thoughts.htm James I]]'', [[Literature/JamesAndTheGiantPeach James Henry Trotter]] is revealed to be the Squib older brother of James Potter (his parents' deaths were the result of a memory charm intended to give him a chance at a normal life without missing magic). After graduating Hogwarts, James and Lily track down James 'Trotter' and re-establish a relationship with him, leading to James Henry becoming the Potters' secret keeper and thus saving them from Voldemort.

** A later chapter reveals that Black Canary, Siryn and Banshee are [[spoiler: half-siblings, via having a GlorifiedSpermDonor father.]]

* ''WebVideo/CodeMent'': [[Anime/CodeGeass Lelouch]] is cousins with [[Manga/SoulEater Death The Kid]], which also makes Lord Death his uncle as well (On his father side, meaning the Britannian royal family is related as well). He also happens to be [[WebVideo/HellsingUltimateAbridged Alucard]]'s nephew too. Alucard is mentioned to be from Lelouch's mother side of the family, making Marianne related to him..

** The next one happens in 2981, when some decisions made during a prior mission to [[VideoGame/FinalFantasyVII Midgar]] creates a chain that causes [[VideoGame/FireEmblemAwakening Lissa]] to conceive [[VideoGame/FinalFantasyXIII Claire and Serah Farron]] as twins. This chain enables a Meme Storm-invoking spell Anise had planned for Lucina to work as intended yet still allowing Robin (who due to the spell is revealed as Lucina's mother) to join the Anise-led Amethysts under pseudo designation.

* More of a peripheral example features in ''[[https://www.fanfiction.net/s/13541327/1/Daughter-of-Darkness Daughter of Darkness]]'', when main character Isabelle "Izzy" Verona eventually learns that she is actually Lyra Black, the daughter of Bellatrix Black and Edgar Bones; Edgar had a brief relationship with Bellatrix after his wife died giving birth to Susan. As a result, Izzy/Lyra is not only Bellatrix's daughter, but also Draco Malfoy and Nymphadora Tonks' cousin, Susan Bones' half-sister, niece to Narcissa Malfoy, Andromeda Tonks and Amelia Bones, and is also chosen by Sirius to be the official heir to the House of Black.

** It's revealed early on that Twilight, Trixie, Starlight, Sunset and Moondancer are all paternal half-sisters whose mothers had them via in-vitro fertilization, and that their father is the exiled alicorn prince [[OriginalCharacter Star Dust]]. The 2018 rewrite keeps all of them, and adds Fizzlepop Berrytwist/Tempest Shadow as a sixth sister.

** While show canon is ambiguous about whether they're related or not, the epilogue confirms that this world's version of [[spoiler:Luster Dawn, Twilight's student from the final episode of canon, is the as-yet unborn daughter of Sunburst and Starlight Glimmer]].

** Discord's mortal mother Shady is Golden Tiara and Diamond Tiara's ancestor, making him their great-great something uncle.

** Hercules' family is TruerToTheText while still being kid-friendly; he's the son of Zeus and Alcmene, who have since divorced and remarried Hera and Amphitryon, respectively. Ariel's father Triton is some sort of cousin, since he's also based on a character from Myth/ClassicalMythology.

** Ash's relationship to Sir Aaron was AmbiguouslyRelated at most, while in this story he's confirmed to directly descend from him through his mother.

** Similarly, no canon sources confirm who is the mother of Giovanni's son Silver. The Holiday Special 2021 confirms that it is Ariana, and that she and Giovanni are married.
** It's heavily implied, though not outright stated, that many canon characters are actually related to [[spoiler:Ash, all of them fathered by the same man. These include Red, Yellow, Ritchie and Arnold.]]

** It's revealed that Serena's father is [[spoiler:Lysander]]. She is also a descendent of [[spoiler:AZ]].

* ''WebVideo/FixingRWBY'': Whereas the canon Vernal had no known relatives, and there was nothing to suggest a blood-relation between her and Raven; ''Fixing RWBY'' heavily rewrites Vernal to be Raven's daughter, which also makes her Yang's biological half-sister and Qrow's biological niece. Vernal's father is also revealed to be Shay D. Mann, a canon bandit, who's renamed Shiloh here.

* ''Fanfic/WhiteSheepRWBY'': Jaune is Salem's son here, though his father is the same. Cinder is also his adopted sister, and the rest of Salem's minions his {{Honorary Uncle}}s.

* ''Fanfic/LuffysMotherIsWho'': Luffy's mother is none other than Charlotte "Big Mom" Linlin, one of the Four Emperors of the New World. Luffy was conceived from Monkey D. Dragon's sperms as payment for supplies for the Revolutionary Army. Dragon, however, did not want his son to be used as a pawn for Big Mom, and kidnapped him in the dead of night before bringing him to be raised by his father Garp.

* In the fanfic ''Fanfic/TheFutureBriefingIsland'', it's revaled that [[Manga/MyHeroAcademia Momo Yaoyorozu and Nemuri Kayama aka Midnight]] are in fact daughter and mother respectively. The reason Midnight uses her maiden name is due to the fact that while Pro Heroes work under aliases, their actual identities are public knowledge, thus a disgruntled and determined villain could use that information against them.
** Another MHA fanfic, ''Evolution'', pulls two similar ones but with different girls, as there Midnight becomes one of Izuku's two additional mothers. Both reveals involve someone showing up to Ogre's Gym (a dojo owned by Quirkless former vigilante Knuckleduster, who had adopted a younger Miruko at some point off-screen) at a time when Izuku, Miruko, and Mei Hatsume were already there.
*** The first time it happened, their classmate Himiko turned up covered in the blood of six gangsters she had just fought off. At the hospital it's discovered through a blood test that her need to consume blood to avoid a Quirk backlash is something she inherited from [[spoiler:her biological father Vlad King]].

** In ''Teen Titans: Witch-Hunt'', the Greek Goddess of witchcraft, Hecate, is revealed as not only Circe's patron and magic tutor, but her mother. She is also [[spoiler:Donna Troy's grandmother, making Circe Donna's aunt.]]

* ''Fanfic/CommonPeople'': The premise is that rather than being HappilyAdopted, Dick, Tim and Jason are Bruce's biological offspring, each from different flings/relationships. Not only does that make them related to Bruce, it makes them related to each other ''and'' to Damian, their youngest brother and Bruce's canonical biological offspring. Understandably, this changes the family dynamics significantly.

* In the ''Earth-2'' setting of ''The Five Earths Project'', [[ComicBook/{{Stargirl}} Courtney "American Girl" Dugan]]'s biological father is Arthur Pemberton, leader of the villain group Strike Force, making her Star Spangled Kid's great-neice.

* ''Fanfic/TheDevilsInTheDetails'': This version of Peter Parker is the step-son of Richard Parker, Peter having been conceived in his mother's brief relationship with Matt Murdock -- AKA Daredevil -- during college.

** ZigzaggedTrope with Rey. [[spoiler: She's still the grandaughter of the Emperor, but its established she was adopted shortly after birth by Luke, who understandingly sees her as ''his'' daughter, and in turn she comes to see [[HappilyAdopted and love him as her father.]]]]

* ''Fanfic/TheLoveClub'': Nessarose is the biological daughter of Turtle Heart, not Frexspar. This was a popular fan-theory that the third book jossed.

** ''[[https://www.fanfiction.net/s/2351695/1/Kings-and-Vagabonds Kings and Vagabonds]]'' reveals that Sky, Bridge, Z and Syd were all children of past Rangers (Jack isn't part of the team in this series) who were abducted by Cruger to serve as Earth's defence against Grumm; Sky is Wes and Jen's son (''Series/PowerRangersTimeForce''), Z is Cole and Alyssa's daughter (''Series/PowerRangersWildForce''), Bridge's parents are Mike and Maya (''Series/PowerRangersLostGalaxy'') and Syd is the youngest child of Carter and Dana (''Series/PowerRangersLightspeedRescue'').

* In ''Fanfic/ANewHopeDanganronpa'', [[VisualNovel/Danganronpa2GoodbyeDespair Mikan]], [[VisualNovel/DanganronpaV3KillingHarmony Kaito and Kokichi]] all turn out to be half siblings, with a shared father between them.

* In the ''Franchise/{{Danganronpa}}'' fanfic ''Fanfic/EverydayLifeWithUltimateGirls'', [[VideoGame/DanganronpaUltraDespairGirls Masaru Daimon]] is the second cousin of [[VisualNovel/DanganronpaV3KillingHarmony Himiko Yumeno]], while [[VideoGame/DanganronpaUltraDespairGirls Jataro Kemuri]] is the son of Taichi Fujisaki's sister and one of the potential Togami heirs. This makes him [[spoiler:the half nephew of [[VisualNovel/DanganronpaTriggerHappyHavoc Byakuya Togami]] and the cousin of [[VisualNovel/DanganronpaTriggerHappyHavoc Chihiro Fujisaki]]]]. As a result, [[spoiler: after Makoto saves them from suicide and their AbusiveParents are arrested, the two are HappilyAdopted into their respective families]].

** Coming just a bit behind Mio, Sena is usually the daughter of Brighid and Morag. The way they are related varies greatly, however. In-game, Sena appears to be a full Blade, which ''should'' mean she was BornAsAnAdult from a core crystal. And yet she grows up normally. Her core is also different from Brighid's, when every canon example of the children of Blades inherits the core of their parent. In ''[[https://archiveofourown.org/works/42625821/chapters/107072754 Endless Strength]]'' Brighid donated part of her core to create a new crystal, which nearly killed her. In ''Fanfic/ADestroyersRemorse'' Brighid and Aegeon created a new core crystal together, which Morag awakened as a Driver, creating a baby Blade who grew up like a human. In ''[[https://archiveofourown.org/works/47138977/chapters/118767880 Campfire Conversations,]]'' Linka remembers Sena as the daughter of Morag and Brighid, but realizes she doesn't actually know how two women produced a child.
** Eunie, being High Entia, was theorized to be Melia's daughter before the game came out. In the actual game, they interact plenty of times with no hint at any such connection, so the theory dropped in popularity. It still shows up in fanfic, though. In ''[[https://archiveofourown.org/works/42077928/chapters/105642030 this goodbye is not the end,]]'' not only is Melia Eunie's mother, but Noah is her twin brother. Their father is Dunban.

*** Similarily, Ashera was theorized to be the daughter of Reyn and Sharla, as her skin tone fits and she uses a fighting style similar to their friend Dunban. The reveal of their daughter Panacea in ''Future Redeemed'' stirred this up a bit more. ''[[https://archiveofourown.org/works/47138977/chapters/118767880 Campfire Conversations]]'' has them meet briefly, [[spoiler:and Panacea has to kill Ashera]].

* In the ''WesternAnimation/KimPossible'' fic "[[https://www.fanfiction.net/s/3497539/1/Some-Wounds-Don-t-Heal Some Wounds Don't Heal]]", a relatively chance encounter between Anne (Kim's mother) and Shego leads to Shego assisting Anne in investigating reports that a doctor in the maternity ward was stealing babies and selling them on a black market. This leads to the discovery that not only was Anne's first daughter one of the stolen babies, but ''Shego'' is that same child. [[spoiler:Once Shego realises and accepts that she is Kim's sister, she ultimately abandons her villain career, accepting that she could never fight Kim now that she knows her rival is her sister]].

* In WesternAnimation/MiraculousLadybug fanfic [[https://archiveofourown.org/works/22799041 Blessed]], Marinette and Nathaniel are twins (the latter's red hair being explained as the result of Tikki giving Sabine a kiss on the belly when Sabine had to give up being the Ladybug heroine Lady Luck due to her pregnancy).

** This means that Eclipsa is also directly related to Star and Moon as their direct ancestor [[spoiler:through her first daughter, Luna.]]

* In ''VideoGame/Persona5'', Futaba Sakura was concieved by Wakaba through unknown means. Some fanfic such as ''[[https://archiveofourown.org/works/25072903/chapters/60732211 Family]]'' have Futaba's father be [[BigBad Shido]], which makes her and Akechi half-siblings.

* In ''Fanfic/{{Daemorphing}}'', Alloran is Estrid's father. While this is a popular ''Literature/{{Animorphs}}'' fan theory, it's never been officially confirmed.
* In ''Fanfic/GoldPoisons'', Wen Xu is Wen Yuan's father, relating A-Yuan directly to Wen Ruohan, Wen Chao and Wen Xu where their relationship was unstated in [[Literature/GrandmasterOfDemonicCultivationMoDaoZuShi the original]].

* In ''Fanfic/TheLoveClub'', Nessarose is the biological daughter of Turtle Heart, not Frexspar. This was a popular fan-theory that the third book jossed.

* In the ''[[https://archiveofourown.org/series/155774 A Hobbit's Hole (er I mean SMIAL!)]]'' series, [[Literature/TheLordOfTheRings Frodo]] is the son of Bilbo and [[Literature/TheHobbit Thorin]] (the latter having been SparedByTheAdaptation).

* ''Fanfic/TheKingNobodyWanted'': Some possible female line Blackfyres are cousins of [[spoiler:Salladhor Saan]].

* In the MassiveMuliplayerCrossover ''Fanfic/CATEAcademy'', British mascots WesternAnimation/PostmanPat and WesternAnimation/FiremanSam are established to be cousins, which by extension makes Pat's son Julian and Sam's niece and nephew, Sarah and James, second cousins.

** The Trimortidae, full stop. Many members are based on real-life people such as Music/StevieRayVaughan (Moon Ray Vaughoof), Jesse Garon Presley (Bossa Nova Heartstrings; Music/ElvisPresley's stillborn older twin brother), and Creator/AlanRickman (Curtain Call). All of them are completely unrelated to each other, but here they were adopted by the [[DontFearTheReaper Three Deaths]] after death, either as siblings or cousins. This also applies to members who are based on fictional characters such as [[ComicBook/TheSandman Death of the Endless]] (Sola Mors) and Knight Shade. Having familial ties with Trimortidae members despite not being part of the group means that you're related to said group as well, [[Music/ElvisPresley Blue Suede Heartstrings]].
** Prince Blueblood's entry notes that he and his family are blood descendants of Princess Platinum, with the most obvious sign of their heritage being their tall heights, when no such connections were apparent in canon. And while he's still Celestia's nephew, here he's explicitly stated to be adopted after Celestia discovered the sheer amount of emotional/psychological abuse Blueblood's birth parents were inflicting on him.
** Prince Léon was a one-bit character who only appeared in a French ''My Little Pony'' magazine as Celestia's young Alicorn "cousin", yet his heavy resemblance to Blueblood is not explained. Here, he's technically Blueblood's biological "son", having been magically created as a karmic backlash to all of Blueblood's good deeds.

** In canon, J. Geil was simply another assassin of DIO, and his only other family was his mother Enya Geil. Here, however, DIO is J. Geil's father, having become a couple with Enya back in the series' version of ''[[Manga/JoJosBizarreAdventurePhantomBlood Phantom Blood]]''.

** In this fanfic, Jackie Applaine (Applejack) and [[Manga/JoJosBizarreAdventureBattleTendency Caesar Zeppeli]] are a couple, and their children are Rarita Zeppeli (Rarity), [[Manga/JoJosBizarreAdventureSteelBallRun Gyro Zeppeli]], and [[Manga/JoJosBizarreAdventureStardustCrusaders Hol Horse]], all of whom held no connection to each other in any canon.
** Lydia Twilight (Twilight Sparkle) and [[Manga/JoJosBizarreAdventurePhantomBlood Robert E. O. Speedwagon]] become a couple, and their great-great-granddaughter is [[Manga/JoJosBizarreAdventureStoneOcean Iro Dashell (Rainbow Dash)]], whereas the canon Twilight Sparkle and Rainbow Dash have no familial ties to each other, and Speedwagon never had any descendants.