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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.
  • In "No Easy Day", General George Hammond (Stargate SG-1) is revealed to be the father of Ashley Hammond, the second Yellow Turbo Ranger (Power Rangers Turbo) and the Yellow Space Ranger (Power Rangers in Space), while General McKnight of Operation Lightspeed is Conner McKnight's father (Power Rangers Dino Thunder).
  • The The Fast and the Furious/Smallville crossover "On the Run" soon establishes that Brian O'Connor is a cousin of Chloe Sullivan, justifying his role in her going into witness protection.
  • In the Once Upon a Time/Descendants crossover "Villains and Happy Endings", Regina is actually the daughter of Cora and Rumpelstiltskin, which leaves Gold horrified when he learns that he put his own daughter through such a brutal training regime.
  • The Buffy the Vampire Slayer/Charmed (1998) fic "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.
  • In the Kim Possible/Grimm crossover A Grimm Possibility and its sequels, Kim's mother Anne is Nick Burkhardt's cousin, making Anne- and thus Kim- a Grimm herself, serving the dual purpose of giving Kim abilities in this crossover series and justifying the family's interaction with Nick.
  • 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:
  • Some Marvel Cinematic Universe fics give Tony Stark a range of illegitimate children that he was unaware of for reasons ranging from the mothers' concerns that he would be a bad influence to Stane hiding their existence as part of his own agenda; some examples include Darcy Lewis ("Star-Spangled Man") and Hermione Granger ("Spellbound").
  • The Last Connor;
    • 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 "James I", James Henry Trotter is revealed to be the Squib older brother of James Potter; 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.
  • The Worst Witch;
    • In The Two Religions", it is revealed that Mildred's magic comes from her biological father, Merlin.
    • In "A Witching Happiness", Mildred's family tree reveals that her father is Alec Trevelyan (GoldenEye although in a new continuity that makes reference to Spectre), with Mildred and Alec being shocked to learn about the other's lives but quickly settling into a father-daughter dynamic.
  • Tara Sheppard makes Tara Maclay the half-sister of then-Major John Sheppard (her mother was his father's secretary for a time).
  • In "Life as Lily Evans-Potter", Mystique is revealed to have adopted the identity of Lily Evans when she accidentally caused the real Lily's death when Lily was a child; her relationship with James and the decision to fake her death were inspired by Destiny's advice, but when she meets Harry for the first time after he's allied with the X-Men, she reveals her identity and affirms that she genuinely loved James.
  • In the Stargate SG-1/Farscape crossover "Syndication", not only are John Crichton and Cameron Mitchell cousins, but it turns out that Aeryn Sun and Vala Mal Doran are half-sisters, as Talyn's death was faked and he stumbled on a wormhole that led him into Goa'uld space.
  • 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 who marries Jon Snow/Stark.
    • 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.
    • Pycelle is revealed to be Tywin's bastard uncle.
  • 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 between My Little Pony: Friendship Is Magic and Hellsing, has Alucard and Princess Luna as Scootaloo's birth parents.
  • The Bridge, a crossover between My Little Pony: Friendship Is Magic and several giant monster movies, including Godzilla:
    • 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 Lea are technically half-siblings, since Xenilla was born from a mixture of Godzilla Senior's blood and Lea's mother's magic.
    • Sunburst's parents adopted Starlight and Moonbeam Glimmer.
  • In the Hasbroverse (crossing My Little Pony: Friendship Is Magic and its earlier generations, along with G.I. Joe, The Transformers and others):
    • 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, respectively.
    • Spike is the grandson of King Spykoran, who's the grownup version of G1 Spike.
  • Yes, My Lady, a crossover between My Little Pony: Friendship Is Magic and 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.
  • In Somnium, Aurora considers the fairies as her adopted mothers, not her Honorary Aunts.
  • In the Happy Highways Where I Went series, Robbie Lewis (Inspector Morse and Lewis) discovers a previously unsuspected American cousin — Darcy Lewis (Thor).
  • The Lost Hero:
    • Kal-El/Clark Kent and Kara-El/Mae Kent are brother and sister instead of cousins.
    • Conner Kent is the son of Clark Kent and Maxima.
    • Ariella Kent is the daughter of Clark Kent and Mary Batson.
    • Karen/Power Girl is the daughter of Billy Batson and Mae Kent.
    • Donna/Wonder Girl is the daughter of Vartox and Diana/Wonder Woman.
    • Like in many other fics, Prince Blueblood is a descendant of Princess Platinum.
  • My Little Titan (crossing My Little Pony: Friendship Is Magic with Teen Titans): Discord is Celestia's father. Also, Dick Grayson/Robin is effectively adopted into the Apple Family as Night Seed.
  • In Tales of Academia, Missy from Yu-Gi-Oh! GX is the daughter of Weevil from the original series when in canon they have no connection other than both using Insect-themed decks.
  • Fates Collide:
    • Jeanne d'Arc is Jaune Arc's sister.
    • 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.
    • Fran is Victor Frankenstein's biological daughter, rather than his creation.
  • In Kamen Rider Zi-O: Heisei Hero King, Tsukuyomi is the granddaughter of Katuski Bakugo.
  • In Spark to Spark, Dust to Dust, it's revealed that Adam is Yang's maternal half-brother, which also means he's related to Raven by way of being her son.
  • SmallvilleX: Evolution:
    • Rogue and Domino were created in a lab from Wolverine's DNA, making them siblings and Wolverine their biological father.
    • Margaret Isobel Thoreaux is Selene's daughter.
    • Clare Selton/Volcana was created from Martha Kent and Sebastian Shaw's DNA, making them her biological parents.
  • In some crossovers between Fate/Grand Order and Fate/stay night, the protagonist in Grand Order is the child of Shirou Emiya and Rin Tohsaka (Mainly because both versions of the former are designed like Gender Flip versions of the latter), as seen in Little Ritsuka and her Loving Family and Fate/Sunny Order.
  • Arturia Pendragon is Jaune Arc's mother in RWBY Zero, having married his father following the Fourth Grail War. This also makes him Mordred's half-brother, which comes into play when he summons her during the next Grail War.
  • Fairy May Cry: Dante and Vergil's mother Eva is the older sister of Layla Heartfilia, Lucy's mother, making them cousins.

    Harry Potter 
  • In Formerly Known as Harry Potter?, Harry, or Lily as she's known, was adopted by the Grangers at age five and raised as Hermione's sister.
  • There are a wide range of 'Severitus' fics where Harry is actually the son of Lily and Severus Snape rather than James Potter.
  • Family Relations is a oneshot where Harry is half-Indian and finds out he is cousins with the Patil twins.
  • More of a peripheral example features in 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.
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    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.
  • In A Tale of Two Rulers, Link is Zelda's child (and Ganondorf's step-child). More specifically, Zelda's daughter Rinku is the current reincarnation of Link.
  • In Blind Courage, Zelda's mother was half-Sheikah and the cousin of Impa. This makes Impa into Zelda's first cousin once removed.
  • In Divorced, Nabooru and Ganondorf are siblings, with Nabooru being the elder sibling.
  • The Arrangement:
    • Urbosa is the mother of Riju and Ganondorf.
    • Link is Zelda's half-brother through the king.
    • Link is adopted by Urbosa.
    • Riju's daughter is Nabooru.

    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 (who went seven whole seasons without having any family introduced - her aunts were first featured in a book released between seasons 7 and 8, and neither they nor her parents appeared in the show itself until season nine, right as it was wrapping up), who has a bond with Rainbow Dash, to turn out to be an orphan and be adopted by Dash. (And while it's not common, it's 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.
  • Early in the fandom it was common to depict Lyra and Bonbon as the mothers of Tootsie Flute.

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.
  • 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.
  • Asylum: In canon, Fluttershy and Rainbow Dash are Childhood Friends. Here, they're foster sisters.
  • Biomom: Rainbow Dash finds out Daring Do/A.K. Yearling is her biological 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.
  • Codex Equus:
    • The Trimortidae, full stop. Many members are based on real-life people such as Stevie Ray Vaughan (Moon Ray Vaughoof), Jesse Garon Presley (Bossa Nova Heartstrings; Elvis Presley's stillborn older twin brother), and Alan Rickman (Curtain Call). All of them are completely unrelated to each other, but here they were adopted by the Three Deaths after death, either as siblings or cousins. This also applies to members who are based on fictional characters such as 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, 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.
  • The Differentverse:
    • Scootaloo is Derpy's niece and, by extension, Dinky's cousin.
    • Coco Pommel is Applejack's little sister via adoption.
  • A Diplomatic Visit:
    • An odd version. The Nightmare, which possessed Luna and turned her into Nightmare Moon, is actually Umbrea, former Lady of Nightmare, leader of the shadow pony sect - who began as dark magic that developed sapience - and the "mother" of King Sombra. In comics canon, the Nightmare Forces that corrupted Luna and the Umbrum that spawned Sombra were distinct groups.
    • Chapter 6 of the sequel Diplomat at Large identifies Twist as Bon-Bon's niece (doubling as a Shout-Out to the Quiververse and RealityCheck's Nyxverse). It's later clarified in chapter 8 that they're actually distant cousins, but still related.
    • Chapter 8 also reveals that Blueblood is descended from Princess Platinum.
    • Chapter 12 reveals that Aria and Sonata are sisters. Subverted with Adagio, who (unlike many fanfiction portrayals) isn't related to them - she was a complete stranger who promised them a feast if they joined her and then used them.
    • The fourth story applies this to the Pony of Shadows; in canon, the origin of the dark entity that emerged from the Well of Shade to possess Stygian and turn him into the Pony of Shadows is never given, but here, it turns out to have been another Umbrum, and thus related to Sombra and Nightmare Moon.
    • While show canon is ambiguous about whether they're related or not, the epilogue confirms that this world's version of Luster Dawn, Twilight's student from the final episode of canon, is the as-yet unborn daughter of Sunburst and Starlight Glimmer.
  • 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.
  • 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.
    • 146.14 has Bulk Biceps and a unicorn version of Coco Pommel as Rarity's older brother and younger sister, respectively (the latter replacing Sweetie Belle).
    • 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.
  • It Started With A Look; by zyr1987: Fancy Pants and Fleur de Lis are brother and sister.
  • Kamen Rider Unicorn: Sunny Flare is the daughter of Abacus Cinch.
  • 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 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.
  • Sisters!?!: The plot kicks off when Twilight discovers that Scootaloo is her younger, maternal half-sister and takes custody of her from the local orphanage. They eventually find out that their mom was a surrogate mother for a friend of hers and the friend's husband, and the couple were killed in a horrific storm shortly after Scootaloo was handed over to them; since they Never Found the Body, she was assumed dead in the same accident until Twilight discovered their relation.
  • 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.
  • SPECTRUM:
    • Princess Cadance is a descendant of Princess Luna here, while Prince Blueblood is a very distant relative. This familial relation also gives Cadance the power to dreamwalk.
    • Princess Amore and Radiant Hope are also mother and daughter here instead. They're also Cadance's ancestors, making them related to Luna as well.

    Pokémon 
  • Examples from Pokémon Reset Bloodlines:
    • Ash's relationship to Sir Aaron was Ambiguously Related at most, while in this story he's confirmed to directly descend from him through his mother.
    • 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.
    • Bertha is a twofold example: she's both the cousin of Agatha, and also grandmother of Roark (her daughter is Byron's wife).
    • The identity of Hau's father isn't revealed in canon, while in this story he's none other than Bruno of the Kanto Elite Four.
    • 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:
  • Everything Changes (Milkyway Scribbles):
    • Pallet Town is so small that many people are related to one another. Ash and Gary are cousins because Ash's dad and Gary's mom are triplets (with their other sister living in Cerulean).
    • Drake from the Orange Islands is Ash's uncle. He's a younger half-brother of Ash's dad who became estranged in adulthood.
  • Pokemon: Shadow of Time:
    • In the new timeline created in this fic, Red and Yellow of the manga are Ash's siblings, while Delia Ketchum is Giovanni’s sister, as well as being a former member of the Elite Four.
    • It is later revealed that Drayden is Iris's paternal grandfather, and Misty refers to Koga and Blaine as her uncles (although this may be more honorary than a reference to their biological relationship).
    • Chapter 29 confirms that Ash's father in this timeline is Grimsley, of the Unovan Elite Four, who was killed protecting Ash from a Shadow Ho-Oh.
    • It is confirmed that in this timeline, Verity is Cynthia's daughter (something that was denied by the film's director).
    • While basically all Pokemon apart from Arceus, the Creation Trio and the Lake Trio are in some way 'related' to Mew, Porygon is a particularly close example as it was created as a result of another attempt to clone Mew.
  • Yamujiburo has a piece of fan-art where Giovanni and Athena are the parents of Silver and Mars.
  • Birthright depicts Jessie as Giovanni's paternal niece. The two aren't close and Giovanni doesn't view her as his niece because she was born out of wedlock.
  • Pokémon Master: Chapter 13 reveals that Duplica is Ash's long-lost younger sister.
  • Ash's Coma treats Giovanni as Ash's father.

    Super Mario Bros. 

    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.
  • White Sheep (RWBY): 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 Uncles.
  • You and Me (and Everyone in Between):
    • Glynda is the adopted mother of Ren and Nora.
    • James Ironwood is Penny's father.
  • In Brawl In The Family AU, Raven is Mercury's mother, making him Yang's half-brother and Qrow's nephew.
  • My Own Worst Enemy:
  • A fanart by Omnipotrent reveals that Qrow is Weiss's real father, having been born from a secret trife with her mother Willow.

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    Anime and Manga fics 
  • One Piece, Two Piece, Red Piece, Blue Piece:
    • Bluejay and Sora are cousins in the fic, but not in RealLife.
    • Phoenix Puzzle, from the anime's Ice Hunter arc, is Shanks' younger brother.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Son of the Sannin:
    • The proverbial nail of the fic is that Jiraya and Tsunade adopt Naruto, with Shizune as his older sister. Because of this, Naruto is now part of the direct family of Hashirama, Mito, Tobirama, and Nawaki. By extension, Naruto and Sasuke technically become cousins due to Shizune marrying Shisui during the Time Skip.
    • Hayate and Yugao become Haku's foster parents after Zabuza's arrest.
    • Mei and Kurotsuchi are second cousins (the former's mother defected from Iwa during the Second Ninja War).
  • The Fairy Tail fanfic series the Alternate Tail Series has Carla's father revealed to be Pantherlily.
    • Rogue (renamed Ryos) is Macao's son instead of Romeo, while Jellal is Ivan's son and thus Makarov's grandson instead of Laxus.
  • In Heroes by Choice Vlad King is Izuku’s father instead of Hiashi.
  • In Reunion, Keitaro is Sarah's father, due to having been raped by her mother when he was only ten. She's not very happy about this, although she does promise to try and be nicer to him.
  • In Lavandula Somnambulist, Izuku is not the birth son of Hisashi and Inko Midoriya. Instead, he is Midnight's son, Hisashi being the donor and Inko being the surrogate mother that carried him to term.
  • Doing It Right This Time: Rei is revealed to be Naoko Akagi's biological daughter (she was supposed to be Yui's, but Naoko switched out Yui's genetic donations for her own), and thus Ritsuko's little sister.
  • One Piece: Luffy's Mother is WHO?: 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.
    • A later chapter hints that Zoro and Nami are siblings and children of a king and queen of an East Blue Kingdom, captured and separated when Zoro was barely a year old.

    Comic Book fics 
  • Ultimate Spider-Woman does this to Spider-Man foe the Chameleon and X-Men villain Mystique, making them siblings.
  • New Tamaran
    • Wonder Girl (Donna Troy) is the daughter of Wonder Woman and Steve Trevor, making her a Composite Character with Fury of Earth 2.
    • In Aqualad's origin, Tula is the daughter of Mera.
    • Red X is revealed to the reader to be Jason Todd, but in Justice Returns he changes his surname to Sandsmark and marries Terra, implying they'll have a daughter named Cassie.
    • Argent is the sidekick and daughter of The Ray.
    • At the end of Justice Returns, the next group of young heroes is the Kingdom Come Titans, but only Nightstar and Red Hood have the exact same parentage. Kid Flash's mother is Jinx, Aquagirl's mother is Bumblebee, and the biological father of Donna's son Robert is the deceased Blue Beetle sidekick Silver Scarab. Also, since Speedy and Donna are married, Robert and Red Hood are stepsiblings.
  • LXG Tempest Rewrite:
  • 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.
    • Robert "Bobby" Queen Ⅱ is Oliver Queen's son by Dinah Lance rather than Shado.
  • Common People: The premise is that rather than being Happily Adopted, 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 Sonic the Continuation, Johnny Lightfoot is Cream's Disappeared Dad.

    Disney fics 

    Film — Live-Action fics 
  • What If (a Marvel Cinematic Universe fic) 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.
  • In Pyotr Romanov Barnes' improbable lifestyle., Peter Parker is the son of Bucky Barnes and Natasha Romanov.
  • Open For All: Through a paternity test that Bruce and FRIDAY unwittingly perform after Tony and Peter survive an unexplained explosion, they discover that Peter and Tony are biologically related, Peter being the result of a brief relationship he had with Mary Fitzpatrick before she met her husband Richard.
  • This Star Wars fic is a twofer for the protagonist of Jedi: Fallen Order, Cal Kestis, who appears as the product of a one-night stand between Bo-Katan Kryze and Obi-Wan Kenobi.

    Literature fics 
  • 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.
  • In The Love Club, Nessarose is the biological daughter of Turtle Heart, not Frexspar. This was a popular fan-theory that the third book jossed.
  • Checkmate: A The Hunger Games fan fiction story by Anla'Shok makes Mags Finnick's great-aunt in addition to his mentor (something that, according to an Author's Note, wasn't planned, but just happened as the story progressed).
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    Live-Action TV fics 
  • In the Battlestar Galactica (2003) fic "All the Time in the Universe", not only is Kacey revealed to be Starbuck's actual daughter rather than just part of Leoben's mind games, but it is revealed later on that Lee Adama is her father as Leoben was unable to use his own genetic material to fertilise Kara's eggs.
  • 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.
  • "Splitting of Souls" reveals that Connor is actually Buffy's son rather than Darla's; Wesley theorises that Buffy and Angel conceived Connor during the day when Angel was briefly human and Darla essentially served as their surrogate, as it's naturally impossible for Slayers to have children on their own (in this reality Robin Wood was just the principal rather than the son of a Slayer).
  • The 10th Kingdom fic "The Last Dragon" reveals that Wolf is actually the great-grandson of both Red Riding Hood and the Big Bad Wolf; his father rejected their family's cycle of revenge and ended up bonding with Queen Riding Hood III's sister after he rescued her from a bear.
  • In the Charmed (1998) fic "Revelations of the Ultimate Kind", it is revealed that not only was Billie adopted, but she's actually Prue's biological daughter, conceived and born when Prue was eighteen; Grams helped Prue hide the pregnancy by arranging an 'internship' once she started to show and then erased Prue's memory of the child.
  • 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.
  • The Flash (2014) series "The Flux Trilogy" has Barry and Iris break up after Nora arrives back in the past; as a result, once Barry and Caitlin acknowledge their feelings for each other, Nora's personal history changes so that she is now Caitlin's daughter, to the extent that her appearance changes and she briefly acquires ice powers.
  • 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.
  • 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 during a trip to Earth she learns that she is the cousin of Tom Paris, as her mother was his father's sister before they lost touch after the government of her colony collapsed. On a less direct note, it is also revealed that Leah Brahms is married to Joe Carey, the assistant Chief Engineer from Star Trek: Voyager.
  • Power Rangers S.P.D.;
    • In Race Against Time, the team discover the present version of the future Nova Ranger, whose real name is Melody McKnight, the daughter of Connor McKnight and Kira Ford of the Dino Thunder team.
    • In Pink Surprise, Sky is established as the son of Wes Collins and Jen Scotts of the Time Force Rangers, with 'Tate' just being Sky's middle name used to protect his identity. In the sequel, Facing the Past, it is revealed that Z's father was Danny Delgado, the Black Wild Force Ranger and SPD's original Black Ranger, who was killed by their current enemy when Z was a child.
    • 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 (Power Rangers Time Force), Z is Cole and Alyssa's daughter (Power Rangers Wild Force), Bridge's parents are Mike and Maya (Power Rangers Lost Galaxy) and Syd is the youngest child of Carter and Dana (Power Rangers Lightspeed Rescue).
  • Crimson Rising reveals that Hunter (the Crimson Ranger from Power Rangers Ninja Storm) is actually the nephew of both Zordon and Lord Zedd; his mother Dulcea was Zordon’s sister while his father Zander was Zedd’s brother, but Hunter was sent far into the future (arriving in our present) shortly after his birth to escape his family’s enemies.
  • 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.
  • In born of hell('s kitchen), Peter was adopted by the Parkers but is ultimately given back to his birth parents: Matthew Murdock and Jessica Jones.

    Video Game fics 

    Western Animation fics 
  • 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.
  • Steven Universe: One common plot is the "Momswap AU," where Steven's mother is any Gem other than Rose Quartz. It originally got popular with Yellow Diamond, back when she was the only Diamond confirmed to exist, but Blue Diamond is also popular now.
    • 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.
    • In the Human AU fanfic Eyes on Me, Sapphire is the granddaughter of Whitney Diamond (on account of Sapphire's father John being Whitney's son) and the niece of the other three Diamonds. By extension, this makes Garnet Whitney's great-granddaughter.
  • In the Beast Wars fic "Dark Secrets", Cheetor learns that Optimus Primal is his actual father rather than just a father-figure; Optimus had a relationship with Cheetor's mother, but she left Optimus without revealing the pregnancy and married the man Cheetor believed was his father to protect Cheetor and Optimus from a dark figure.
  • 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 sister rather than Dagur's; Valka was pregnant with Heather when she was 'abducted' by Cloudjumper and Hiccup met them after he ran away from Berk.
  • In Prodigal Son, Tuffnut refers to Mildew as "old uncle Mildew".
  • The Powerpuff Girls Re Imagined:
    • Professor Utonium is the Powerpuff Girls' biological father. He used his unborn triplets when creating them.
    • The comic depicts Sedusa as a revived clone of Professor Utonium's wife and the Powerpuff Girls' mother.
  • In Robotboy canon, Robotgirl was made to be a companion for Robotboy. In Human After All the two have a sibling relationship.
  • In Total Drama All-Stars Rewrite, Dave is revealed to be Noah's cousin.
  • In Miraculous Ladybug fanfic 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).
  • Unbreakable Red Silken Thread: Scarlett is Izzy's cousin.
  • In Miraculous Ladybug, Marc and Marinette are just students who happen to go to the same school. In Marc Being In A Gang Rights, they're cousins.
  • In the Transformers Animated fanfic Lost Soul, Megatron is Bumblebee's carrier (or mother), while the Fallen is Bee's sire (or father).
  • In the Transformers Animated fanfic Carry On Wayward Son by Kenyastarflight, Megatron is Optimus's long-lost father (Optimus having been kidnapped from him by pirates as a child), and implied to be a Truly Single Parent.
  • In the X-Men: Evolution fanfic All's Fair in Love and War, it's revealed in chapter 4 that Jean Grey and Lance Alvers are twins, with Lance being sent to live with his uncle and aunt in Illinois after their mother suffered an emotional breakdown following her husband's death and Jean going into a coma. It's later revealed that their mother's adopted sister was Magneto's wife and Pietro and Wanda's mother.
  • In another X-Men: Evolution fanfic XXY:Evolution, where a majority of the characters are genderbend, Male!Rogue is Mysterioss's (male Mystique) biological son. This also makes Male!Rogue and Female!Nightcrawler half-siblings instead of step-siblings like in most versions.
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