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    Crossover 
  • Plenty of Crossover fanfics do this by taking one given character from one of the universes and making them a distant cousin (or estranged sibling, but cousin is much more common) to a (preferably) similar character from the other universe, bypassing the need for more elaborate explanations as to why characters from two different works are suddenly coming together.
    • A particularly common example of this is X-Men/Buffy the Vampire Slayer crossovers, which make Buffy Summers and Cyclops cousins due to them sharing the same surname.
  • In I Am Superman, a crossover between Worm and The Iron Giant, Taylor is the granddaughter of Hogarth Hughes on her mother's side of the family.
  • In Azumanga Und Panzer, there are two examples:
    • Sakaki and Nonna are cousins, an idea likely derived from their similar appearances as tall girls with long, dark hair.
    • Implied with Kagura and Minamo "Nyamo" Kurosawa. The former's full name in this fic is Kagura Kurosawa, which means that she might be related to Nyamo.
  • In the RWBY/Marvel Cinematic Universe Fusion Fic In Shades of Red and Gold, instead of being Taiyang's ex-wife and Yang's biological mother, Raven Branwen is Taiyang's half-sister and Yang's aunt, Qrow is Taiyang's half-brother, and Summer is Yang's biological mother. In an inversion, Taiyang isn't Ruby's father, Tony Stark is (she's also the reason Taiyang walked out on Summer).
  • The Twilight/Heroes fanfic Lightning Strikes reveals that Alice Cullen is actually the presumed-dead sister of Angela Petrelli.
  • The Buffy the Vampire Slayer/Stargate SG-1/Battlestar Galactica crossover An Extraordinary Journey features a few of these; not only do characters speculate that the resemblance between SGC Major Lauren Satterfield and the Number Eight Cylon models is because the Eights were based on a distant relative of Satterfield's, but it is eventually revealed that Willow Rosenberg and Dawn Summers are formerly-Ascended Ancients who were actually sisters in their original lives; Athena/Willow chose to take human form again as an experiment, and Hera/Dawn bonded herself to the Key to help trap it and prevent Glory using it to destroy the universe.
  • Finmonster's The Marvelous World of DC and its sequels reveals that Hellboy and Raven (of the Teen Titans) are actually half-siblings, with Trigon their mutual father (although there is such a significant age gap that Raven is raised as Hellboy's daughter rather than his sister, as requested by Raven's mother).
  • In The last Connor- a crossover between Terminator and Alien- Rebecca 'Newt' Jordan is revealed to be the last living descendant of the Sarah Connor who exists after Terminator Genisys, prompting "Pops" to defend her as though she was his own 'child'.
    • At the same time, Corporal Dwayne Hicks is revealed to be a descendant of the Kyle Reese who existed in the new timeline, as an Actor Allusion to the fact that Michael Biehn portrayed both characters.
  • In the The Worst Witch fanfic The Two Religions, it is revealed that Mildred's magic comes from her biological father, Merlin.
  • Tara Sheppard makes Tara Maclay the half-sister of then-Major John Sheppard (her mother was his father's secretary for a time).
  • Once Upon a Supernatural Time has a few of these;
    • When Crowley visits Storybrooke, he reveals that Crowley's mother Rowena is also Cora's mother, as she fled to this world after teaching Cora her magic, which makes Crowley Cora's half-brother and Regina's uncle.
    • Tamara is revealed to be the daughter of Dean's old foe Gordon Walker.
  • What Insertion?: Azusa Shiratori and Shiho Miyano are revealed to be cousins, something which is a bit of a bombshell in-universe. On an occasion when Azusa accidentally broke up a Black Organization operation just by being herself, this results in Sherry becoming both respected and feared by the B.O.'s lower-ranked members.
  • To Belong:
  • Frankie Rules makes Mac from Foster's Home For Imaginary Friends the cousin of Tommy from Robotboy. This is because they both have similar character designs.
  • In Smallville fanfiction "Stronger Together", Kara Danvers and Carol Danvers are sisters.
  • Golden Blond And Jet Black is a crossover where Mavis from Hotel Transylvania and Rapunzel of Tangled are respectively the daughters of Pitch and Sandy from Rise of the Guardians. The story ends with Mavis and Rapunzel adopting Vanellope from Wreck-It Ralph.
  • As the A Song of Metal and Marvels series combines the Marvel universe with A Song of Ice and Fire, there's a bit of this going on:
    • Tony Stark is Ned Stark's cousin, making him first cousin once removed to the Stark children.
    • Bruce Banner becomes Bruce Tarth, Brienne's cousin.
    • Natasha Romanoff becomes Natasha Martell, Oberyn's oldest and only legitimized daughter.
    • Mystique is the long-lost daughter of Duncan Targaryen, making her Daenerys' first cousin once removed and Jon's first cousin twice removed. Also, Magneto is a Blackfyre, making him a more distant cousin to all three.
  • In the Jackie Chan Adventures/W.I.T.C.H. crossover Guardians, Wizards, and Kung-Fu Fighters, the Chans and Lins are cousins in the new Merged Reality. Specifically, Uncle and Yan Lin are first cousins, with the rest descending from that point.
  • The Last Son: This is pretty much inevitable when merging the DC and Marvel universes:
  • The Many Dates of Danny Fenton (Danny Phantom Western Animation, TV Series, and Comic Books.):
    • In the "Parallel Sailor Moon" short, Sailor Jupiter has a daughter named Mako, though the father is notably not present. If Danny choose her, he becomes Mako's father.
    • In the MC 2 comics, Felicia's daughter Felicity was Flash Thompson's daughter. In the ending with her, Danny is the father.
  • Daughter of Darkness, a crossover with Hellsing, has Alucard and Princess Luna as Scootaloo's birth parents.
  • The Bridge:
    • Pipsqueak and Octavia are cousins.
    • According to the spinoff The Bridge: Humanity's Stand, Marshal Stacker Pentecost adopted Miki Saegusa as well as Mako Mori.
    • Raiga was made a member of Godzilla's species and considered an honorary cousin.
    • Princess Cadance is the daughter of Princess Amore (time travel was involved, since Amore lived over 1000 years ago).
    • Prince Blueblood is a descendant of Princess Platinum.
    • Flash Sentry and Indigo Zap are cousins. 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.
    • The Windigos raped Princesses Melpomene and Hymnia and conceived the three Sirens: Adagio Dazzle, Aria Blaze, and Sonata Dusk. Adagio and Sonata are both Melpomene's daughters but have different fathers, while Aria is their cousin as Melpomene and Hymnia were sisters.
    • Xenilla (Spacegodzilla) and Mothra are technically half-siblings, since Xenilla was born from a mixture of Godzilla Senior's blood and Lea's mother's magic.
  • In the Hasbroverse:
    • Caramel is a cousin of Applejack, Apple Bloom, and Big Mac.
    • Celestia and Luna are the daughters of the Princess Ponies via their magic wands. Also, Megan, Danny, and Molly were their honorary aunts and uncle.
    • Twilight, Firefly, G1 Applejack, and (presumably) Surprise are the ancestors of Twilight Sparkle, Rainbow Dash, FiM Applejack, and Pinkie Pie.
    • Spike is the grandson of King Spykoran, who's the grownup version of G1 Spike.
  • Yes, My Lady, a crossover with Black Butler, pulls off both this and Family Relationship Switcheroo by having Apple Bloom and Diamond Tiara revealed as twin sisters... whose biological parents are Applejack and Filthy Rich.
  • Comatose: Jasmine and Aladdin are brother and sister. They're both orphans who live on the streets together.
  • This happens a lot on Earth 27, with several characters becoming related in one way or the other:
    • Tim Drake and Dinah Drake are cousins thanks to a philandering shared grandfather.
    • Carrie Kelly becomes the cousin of Barbara Gordon.
    • Sarah Essen becomes Jim Gordon's wife and the mother (rather than step-mother) of Barbara and James Jr.
    • Nyssa Al Ghul becomes the mother of Connor Hawke.
    • Adeline Kane (Slade Wilson's ex-wife), is the sister of Nathan, Jacob and Martha Kane, making her sons Grant and Joseph cousins of Bruce Wayne and Kate Kane.
    • Hank and Don Hall (the first Hawk and Dove), become the younger brothers of Carter Hall (Hawkman).
    • Zinda Blake (Lady Blackhawk) becomes the older twin sister of Eddie Blake (The Comedian).
  • Dad's Old Shirt is a Calvin and Hobbes fanfic that ties into Peanuts. Calvin is biologically Lucy's son but was Happily Adopted as an infant by Patty and Mark (AKA, Marcie).
  • Neither a Bird nor a Plane, it's Deku!:
    • Itsuka Kendou is the daughter of Yoru, Bruce Wayne's former martial arts sensei in the DC Animated Universe.
    • Tooru Hagakure's mother is Kimiyo Hoshi, aka the heroine Dr. Light.

    The Legend of Zelda 
  • In The Legend of Zelda: The Sage of Darkness, Dark Link is revealed to be Link's father, having resurrected himself through his son's shadow.
  • Zelda and Link are brother and sister in the fan novel Zelda and the Manacle of Cahla.
  • Their Bond:
    • Zelda and Link were raised as siblings dating back to Link leaving the Kokiri forest. However, Link prefers not to be Adopted into Royalty and instead views Zelda's advisor Mikal as his surrogate father.
    • Impaz is the grandmother of Ocarina of Time's Impa.
    • Wind Waker's King Daphnes is the father of the Twilight Princess Zelda.
    • Saria was Link's Parental Substitute, not just his Childhood Friend.
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    My Little Pony: Friendship is Magic 

General

  • Many My Little Pony: Friendship Is Magic fics depict Amethyst Star/Sparkler as Derpy's daughter and Dinky's sister, even though Derpy and Amethyst look about the same age. (This owes to Dinky and Sparkler appearing in the Sisterhooves Social race together, and fanon having long held that Dinky is Derpy's daughter due to similar color schemes). Some fans ignore it or say that Sparkler is a close family friend who's like a sister, others make Derpy a bit older and Sparkler a bit younger than they both look and bring Sparkler into the family.
    • It's not as popular but some fans have taken the route of making Sparkler Derpy's sister. Other options include "Sparkler is Derpy's niece and therefore Dinky's cousin" and "Sparkler is the cousin of both Derpy and Dinky, who are sisters" (while not as popular as mother/daughter, there are fans who like Dinky as Derpy's little sister).
  • It's also common for Scootaloo, whose parents were introduced nine seasons in and who has a bond with Rainbow Dash, to turn out to be an orphan and be adopted by Dash. (Though it's not common, though also not unheard of, for them to turn out to have been related all along, even to the point of Rainbow being Scootaloo's birth mother.)
  • A lot of early fanworks depicted Octavia as Pinkie's sister because she had a slight resemblance to one of her siblings. This has since fallen out of fashion and has been jossed in canon. Fans however still do often write Octavia as Lyra's sister (they both have string instrument Cutie Marks), something that hasn't been clarified in canon
    • Octavia as Pinkie's cousin is still popular, which would make Pinkie and Lyra cousins if used with the above Octavia and Lyra relation.
  • The Sirens from Equestria Girls are often written as sisters. In canon, their relationship is unclarified.
  • Cheerilee as background pony Berry Punch's (also known as Berryshine) sister has appeared in many works due to their similar colour palettes. According to a comic, Cheerilee does have a twin sister; however any other siblings aren't mentioned.
  • Multiple stories, including But I'm Here For You Now, depict Fluttershy as Scootaloo's birth mother, who gave her up for adoption because she couldn't care for a foal on her own.
    • Fluttershy and Scootaloo can also be written as estranged siblings or cousins.
  • Cheerilee and Scootaloo as sisters (which is taken from Generation 3.5) has some popularity.
  • It's not uncommon for Twilight Sparkle to be depicted as Spike's mother due to the show varying on what their relationship is.
  • Caramel is frequently interpreted as a cousin of Applejack's.

Specific

  • Aftermath of the Games:
    • Unlike the pony versions of Rainbow Dash and Scootaloo who are just surrogate sisters, the human Rainbow Dash and Scootaloo here are real sisters.
    • Also, even though no relationship is established between them in canon, here Cinch is revealed to be Fleur's mother.
  • The Alternate Tail Series has Carla's father revealed to be Pantherlily.
  • In The Apprentice, the Student, and the Charlatan, Trixie Lulamoon and Twilight Sparkle are stated to be distantly related due to the Lulamoon clan inter-marrying with the Novus clan over the years, before the Sparkle clan materialized as a branch of the Novuses.
  • In My Little Pony: Friendship Is Magic, Fluttershy and Rainbow Dash are Childhood Friends. In the fanfic Asylum they are foster sisters.
  • Biomom: Rainbow Dash finds out Daring Do/A.K. Yearling is the mother who gave birth and then abandoned her. A time-traveling Twilight turns out to be Luna and Celestia's birth mother.
  • Children of the Star:
    • 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 Star Dust. The 2018 rewrite keeps all of them, and adds Fizzlepop Berrytwist/Tempest Shadow as a sixth sister.
    • In the original version (before its 2018 rewrite), during the search for Star Dust, the quintet also meet LQ73, an A.I. and his first-built son, and learn from him that not only is Spike also their naturally-conceived half-brother, they have four younger Earth Pony siblings (Silver Spoon, Pipsqueak, Twist and Babs Seed) who were conceived in the same manner as the girls themselves. It's later revealed they have another sister: Scootaloo.
    • Star Dust also had a sister, Dust Bowl, who became the ancestor of Stinking Rich (and through him, of Filthy Rich and Diamond Tiara). This is still true in the 2018 rewrite.
  • The Differentverse:
    • Scootaloo is Derpy's niece and, by extension, Dinky's cousin.
    • Coco Pommel is Applejack's little sister via adoption.
  • Firebird Dahlia: Sunset and Spitfire are estranged sisters. Neither is entirely happy when others find out.
  • Flying High: Scootaloo turns out to be the daughter of Trixie Lulamoon and Prince Blueblood.
  • Friendship is Witchcraft: Rainbow Dash is Scootaloo's very distant mother.
  • Friends with Everybody:
    • Of Wondercolts and Shadowbolts reveals that Abacus Cinch and Sunny Flare are mother and daughter.
    • Flash Sentry and Scootaloo are brother and sister. Later, it's revealed that Rainbow Dash is their paternal half-sister.
    • Adagio is the ancestor of the Element Bearer's human counterparts, and by extension their siblings and at least one parent for each.
  • The Harmony's Warriors series does this several times:
    • Rainbow Dash and Trixie are adopted sisters, Rumble and Thunderlane are their brothers, and they're all Celestia's children.
    • Scootaloo is Daring Do's niece.
    • Featherweight is Filthy Rich's son.
    • Apparently Celestia is on Shining Armor and Twilight's family tree. Though this has only been explored briefly, Word of God is that it's an important plot point.
  • It Started With A Look; by zyr1987: Fancy Pants and Fleur de Lis are brother and sister.
  • My Secret Daughter: Diamond Tiara is the daughter of Starlight Glimmer and an unknowing Double Diamond (Starlight broke up with him once she found out she was pregnant and never told him about their child), whom Starlight later gave up to Spoiled Rich after the other mare lied to Starlight about having miscarried and, still wanting a child of her own, promised to take care of her. Years later, when Starlight finds out what kind of pony Spoiled really is, she immediately takes steps to get her daughter back.
  • One Awesome Mom: Scootaloo lives with her maternal aunt Ditzy Doo and cousin Dinky, because her actual mom is Ditzy's sister Daring Doo, who spends most of her time at archaeological digs and is the basis for the main character in her sister's Daring Do novel series.
  • Pony POV Series:
    • Octavia Melody and Photo Finish are Pinkie Pie's sisters, though they left the rock farm at an early age to become a musician and photographer respectively, which is why they hardly interact.
    • Berry Punch is Cheerilee's sister.
    • Screwball is Filthy Rich's wife and Diamond Tiara's mother. In the fic, she is named Golden Tiara, though some characters call her Screwball as an insult. It's later revealed that Golden's parents wanted her name to be Spoiled Rich, the canon wife and mother to the family, and if circumstances had been different, Golden would have been just like Spoiled Rich.
    • Many characters from G1 and My Little Pony Tales are Famous Ancestors of the current characters.
    • Discord's mortal mother Shady is Golden Tiara and Diamond Tiara's ancestor, making him their great-great something uncle.
    • Prince Blueblood and Princess Cadence are cousins.
  • Quiververse: Several examples, some based on fanon and some from the author's own imagination.
    • Whereas it's remained unconfirmed in the series proper, Applejack and Pinkie Pie are confirmed to be distant cousins thanks to research by Pinkie's mother, Cloudy Quartz.
    • Cadance is suggested as being the descendant of Princess Amore, the last legitimate ruler of the Crystal Empire before Sombra usurped the throne.
    • Bulk Biceps is Featherweight's maternal uncle in this storyline, whereas they've never so much as interacted in the series itself.
    • Twist is Bon-Bon's niece (doubling as a Shout-Out to RealityCheck's Nyxverse).
  • Scootaloo's Parents Are: Shining Armor, who never knew about her (but it's implied that he would have gladly taken her if he had known), and Spitfire of the Wonderbolts, who abandoned her in an orphanage as soon as she could because she felt she couldn't take care of a foal on her own.
  • Seven Days in Sunny June: This happens to numerous human characters. When Sunset returns to Equestria in book 2, she finds that at least some of these relationships are exclusive to the human versions and not the case with their pony counterparts.
    • Sunset is taken in and pretty much adopted by human Twilight's family.
    • The Spike of this world is human and Twilight's little brother. Octavia is also Twilight's cousin via their fathers.
    • Fiddlesticks is Octavia's cousin via their mothers, while Screwball and Midnight Moondust are sisters, and both are second cousins to Octavia.
    • Rainbow is descended from Commander Hurricane, and Scootaloo is her Happily Adopted little sister. (Explicitly not the case for their pony counterparts, though they have unofficially adopted one another as sisters.) Spitfire is Rainbow's cousin.
    • Angel is Fluttershy's little brother. DISCORD of all people is their Disappeared Dad. Tirek, his former bandmate and still good friend, is Fluttershy's godfather.
    • Crackle is Suri Polomare's half-sister by her father's mistress.
    • Blueblood and Flash Sentry are cousins.
    • Pinkie Pie is the niece of Carrot and Cup Cake (her mother and Cup are sisters). Pony!Pinkie, when she finds out, tells Sunset that her world's Cake family aren't her blood relatives, but she wouldn't mind if they were, since they ARE like a second family to her.
    • Coco Pommel is Fancy Pants' little sister.
  • Scootaloo's Sunrise Surprise: Scootaloo turns out to have an older unicorn sister she never knew about: Sunset Shimmer.
  • The Infinite Loops / MLP Time Loops:
    • Many loops have characters being related when they weren't in baseline. This includes Loops where Twilight has one or more of her friends as her sibling(s) or child(ren), and at least one loop where Mrs. Cake is a distant cousin to Pinkie, who's very excited (she runs down the street repeatedly screaming "The Cake is a Pie!" when she finds out).
    • Rainbow Dash has had Loops where she's the daughter (usually estranged) of Photo Finish.
    • Scootaloo has been related, by blood or adoption, to every Equestrian Looper.
    • In 202.12, Diamond Tiara is the daughter of Applejack and Filthy Rich (the writer admits to being inspired by Tatsurou's Yes, My Lady) from a one-night stand after Filthy found out his parents had arranged for him to marry Spoiled Milk, and was raised by her father and stepmother with the promise that if she found out about her birth mom and wanted to rejoin her, Spoiled wouldn't stand in the way.
  • The Secret of Motherhood: Starlight Glimmer reveals that she had a daughter who was stolen from her at birth, who turns out to be Scootaloo. Her father was Wind Rider of the Wonderbolts.
  • The Sparkle In His Eye:
    • Sunset Shimmer is the latest incarnation of the daughter of Celestia and her phoenix Philomena, who had transformed into a male pony in an effort to comfort Celestia years ago.
    • Rainbow Dash is Daring Do/A.K. Yearling's long-lost daughter. The author admits to being inspired by Biomom.
  • In The Royal Sketchbook, Blueblood isn't related to Celestia. He's royalty through Princess Platinum.
  • In the oneshot A Great and Powerful Legacy, Trixie is a descendant of Starswirl.
  • The Flash Sentry Chronicles:
    • Trixie mentions that her family line could be traced all the way back to Starswirl The Bearded.
    • It is eventually revealed that Flash Sentry and Scootaloo are long-lost siblings.

    Pokémon 
  • Examples from Pokémon Reset Bloodlines:
    • The main story reveals that Misty and her sisters are cousins of Kalos Elite Four member Siebold.
    • Ritchie and one-shot character Silver from Pokémon Chronicles become this when the latter marries the former's mother.
    • And it's heavily implied, though not outright stated, that many canon characters are this to Ash, all of them having been fathered by the same man. These include Red, Yellow, Ritchie and Arnold.
  • In the Pokémon fanfic series The Road You Choose, not only is Ash's father identified as Pokémon Master Red, but Red is also the father of Ash's friend Dawn, and Jessie learns that part of the reason her and James's mistakes were tolerated for so long is because Giovanni is her father.
  • In Traveler, Giovanni is revealed to be Ash's father.
  • In Lost, Delia reveals to Professor Oak that Ash's father is Giovanni of Team Rocket. She ran off after learning he was a criminal, but not before she became pregnant with Ash. She never told Giovanni about Ash and lied to Ash about his father.
  • Back To Zero:
    • Giovanni is secretly both Ash's and Jessie's fathers, which also makes Jessie and Ash into half-siblings.
    • Oakley, Annie, and Mondo are siblings.
  • In Mended, a seventeen year old Ash finds out that Professor Oak is his father.
  • Witchcraft:

    Super Mario Bros 
  • Change Of Heart is one of many Super Mario Bros fics that depict the Koopalings as Bowser Jr's older siblings. In canon, they're unrelated.
  • Word of God confirmed that canonically, Wario & Waluigi from the Super Mario Bros. series actually aren't brothers, however, they are brothers in SMG4's Mario Bloopers.
  • My Pain, My Thrill:
    • Bowser Jr is Peach and Bowser's son, though Peach herself isn't even aware of this until three years after his birth.
    • The Koopalings are Bowser's nephews and niece.
  • Married to the Koopa King:
    • Daisy and Peach are cousins.
    • The Koopalings are Bowser's kids.

    RWBY 
  • In Linked in Life and Love, Summer Rose and Roman Torchwick are siblings. Moreover, Ruby is not the child of Summer and Taiyang, but rather the biological child of Summer and Raven.
  • Let Me Hear is a RWBY fic that turns Blake and Weiss into adopted sisters. As a child, Blake was adopted into the Schnee household after her parents were killed.
  • RWBY: Scars:
    • Taiyang is Ruby's step-father. Her biological father is Qrow.
    • Sienna Khan is Kali's sister, making her Blake's aunt.
    • Penny is essentially Ironwood's daughter. She contains the soul of Ironwood's dying daughter Penelope.
    • Neo is Roman's daughter.

    Other 
  • The Buffy the Vampire Slayer/Angel fic ''Bring Me To Life has all but explicitly stated that Caleb is Lindsey's brother, with the two having had such a serious falling-out years ago that Lindsey thanks God his family were rid of Caleb even before he learns that Caleb is serving the First.
  • Most Alternate Universe Fics for Kingdom Hearts with a less fantastical setting use this trope to adapt certain characters' canonically... let's say metaphysically unusual relationships. Sora and Roxas in particular tend to be Polar Opposite Twins, with Namine, Xion, Ventus, and Vanitas popular choices to be related to them and/or each other.
  • Empath: The Luckiest Smurf has Hefty and Handy related to each other as twin brothers, rather than as just friends in most other adaptations of The Smurfs. However, since the franchise has never stated if Papa Smurf getting the Smurfs from the stork and raising them makes them family, it may actually be an inversion for all other Smurfs instead.
  • One Piece, Two Piece, Red Piece, Blue Piece:
  • Ultimate Spider Woman does this to Spider-Man foe the Chameleon and X-Men villain Mystique, making them siblings.
  • The Doctor Who fanfic Nothing is Ever Forgotten reveals that the Eleventh Doctor's restoration at Amy Pond's wedding also restored the memory of Amy's maternal aunt, Donna Noble-Temple.
  • Steven Universe While Jasper does call Amethyst her sister in canon, it's clearly metaphorical; they weren't even created in the same kindergarten. A lot of Human Au fics portray Jasper and Amethyst as either sisters, half-sisters, or some other form of familial relationship.
  • Dragon Ball Z Abridged:
    • In the special Episode of Bardock, it's revealed that the inhabitants of the Planet Plant/Vegeta are primitive Saiyans. However, with the release of Dragon Ball Super, it turns out that Saiyans were originally from a different planet entirely, making them unrelated to that species in canon.
    • Lord Slug is revealed to be Guru's good half, but they're completely unrelated to each other in the source material.
    • Mouri and Dende are changed from technical siblings (thanks to both of them being fathered by Guru), to Mouri being Dende's father. Considering Guru undergoes Adaptational Villainy, probably for the best.
    • Dr. Gero's son refers to Dr. Flappe as his uncle, though he might be of the Honorary Uncle sort.
  • To Hell and Back (Arrowverse) both inverts this and plays it straight. Thea Queen is not Malcolm Merlyn's biological child with Moira — Oliver, however, is.
  • In The Heart Trilogy, a series of Tolkien's Legendarium fics, Smaug is a great-great-grandson of Ancalagon the Black, the greatest dragon to have ever existed.
  • There are many fics that portray Goku and Turles as cousins, sometimes Turles is Goku's twin brother and in the most weirdest of the cases, Turles is Goku's uncle.
  • The Star Trek: The Next Generation fanfic Big Doors and its sequels not only make Tasha Yar essentially the adopted daughter of Tuvok from Star Trek: Voyager, but make her the long-lost biological cousin of Tom Paris.
  • In Prodigal Son, Tuffnut refers to Mildew as "old uncle Mildew."
  • A particularly dark example in the Mummies Alive! fanfics by Julie Horwitz, which reveal that Ja-Kal's nephew, Kimas, is actually Nefer-Tina's son, as his brother Arakh was hired to rape Nefer-Tina by Ja-Kal's jealous wife Tia (Tia ignoring the fact that Nefer-Tina had shown no sign of acting on her feelings for Ja-Kal).
  • In the Dreamworks Dragons fic The Grimborn Sister, Astrid is now the sister of Dragon Hunters Viggo and Ryker Grimborn, although it is soon established that she has no actual involvement in their business and ends up falling for Hiccup through sheer chance.
  • The How to Train Your Dragon fic Shadow and Silver makes Heather Hiccup's half-sister; Valka was pregnant with Heather when she was 'abducted' by Cloudjumper and Hiccup met them after he ran away from Berk.
  • In the Pirates of the Caribbean fic Birds of a Feather, Philip- the young priest who was on the Queen Anne's Revenge- is Elizabeth Swann's cousin, resulting in him joining Will and Jack in their initial attempt to rescue Elizabeth from the Pearl.
  • Fates Collide:
    • Mash Kyrielight is Lancelot and Guinevere's daughter, rather than her being possessed by their son Galahad, who doesn't exist here.
    • Reika Rikudou is Jack the Ripper's mother.
    • Mercury Black and Ushiwakamaru are siblings.
    • Mordred is actually the daughter of Arturia and Diarmuid.
  • In Robotboy canon, Robotgirl was made to be a companion for Robotboy. In Human After All the two have a sibling relationship.
  • What If repeatedly brings up Loki's resemblance to Hela, making more than one character suggest he's her son with Laufey, making him Odin's grandson and Thor's nephew. Hela herself eventually confirms it.
  • Izuku Midoriya's father in canon is basically a non-entity, but in Conversations with a Cryptid he's All for One. Similarly, his mother Inko is Nana Shimura's daughter, making her Shiragaki's aunt.
  • In Super Smash Bros. Ultimate: World of Light, Dr. Mario is the cousin of Mario and Luigi.
  • In the Meet the Robinsons fic The Future Child, Today, Wilbur isn't from the future, which obviously changes several twists from the movie. Instead of being Lewis and Franny's Kid from the Future, he's the son of Bowler Hat Guy, who is not Goob. He and Lewis are both adopted by Bud and Lucille by the end, though.
  • Our Own League series:
    • 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 Donna Troy's grandmother, making Circe Donna's aunt.
    • M'gann M'orzz was the foster daughter of King Jemm of Saturn and his wife Cha'rissa as a war refugee living on Titan, before relocating to Earth with J'onn. In DC canon, M'gann and Jemm have never even met.
  • In Power Rangers Clockwork, Aricin Velothi is the son of Brynja and Asgaut Velothi. His counterpart in the original Skyrim mod Clockwork, the Amalgam, has no known relationships between Lamashtu and Lahar.
  • Tokimeki PokéLive! and Twinbee: Ai Miyashita and Coco Miyashita are cousins while neither Love Live! School Idol Festival nor Love Live! School idol festival ALL STARS clarifies any relation between them.
  • There Will Be Brawl: Waluigi is Wario's brother. In Super Mario Bros, they're only Ambiguously Related.
  • The Naruto fic I Am Not Going Through Puberty Again treats every single redhead in the franchise (canon or filler) as being a member of the Uzumaki clan.
  • In MGLN Crisis, Fate turns out to be half-siblings with her adoptive brother Chrono when a DNA test reveals that her biological father was Clyde Harlaown, something that is outright impossible in canon due to Clyde only being several years older than Alicia (the girl Fate was cloned form). This is actually a plot point, as it would turn out that it was actually an aged up clone of Clyde, using a prototype of the very technology that would lead to her own creation (and since Fate is canonically the first stable clone in the series, he suffered from Clone Degeneration after only three years).
  • Desert Gold is an Alternate Universe Fic where Ed and Al are half-Ishvalan through their mother Trisha. It's mentioned that Scar is their kin, but their exact relationship isn't clarified.
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