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Crossover Relatives

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A common way to establish a strong connection between two works in a Crossover is to establish two or more characters from the source works as being related. The primary hitch with this is explaining why these relatives haven't interacted with each other before; as such, some means of establishing distance is also common — a lost child, an estranged sibling, a distant cousin...

The trope isn't necessarily about individuals and can be applied to larger groups, up to and including entire species. For instance, a way to explain the presence humans in some distant system or galaxy is to have them as a Lost Colony of Earth — which can be a lot more plausible than two identical species arising by pure chance. This also serves as a way of more closely integrating two or more settings into each other.


A Sub-Trope to Related in the Adaptation and Obvious Crossover Method. Compare Crossover Couple and Historical Character's Fictional Relative.


Examples on subpages

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    Anime & Manga 

    Comic Books 
  • Adventure Time x Regular Show: The Ooo version of Death and the Regular Show's one are revealed to be cousins, squabbling ones at that, who do their jobs in their respective dimensions.
  • All-Star Squadron established that Starman (a Golden Age DC character) and Phantom Lady (a Golden Age Quality character that was later acquired by DC) were cousins.
  • Archie Comics produced a series from the late '60s to the early '80s titled That Wilkin Boy. Although the series took place in Midvale, the main character, Bingo Wilkin, was eventually found to be a cousin of Jughead Jones from the regular Archie Comics set in Riverdale.
  • Daken: Dark Wolverine: Daken's evil ex-boyfriend turns out to have been an Honorary Uncle of Chase Stein of the Runaways, giving Daken an excuse to recruit the Runaways in order to help take him down.
  • GoBots: IDW Publishing's miniseries ends with strong implications that the GoBots are actually precursors to the Transformers, one example being that it is hinted that Road Ranger and Bug Bite are the respective fathers of the Autobots Optimus Prime and Bumblebee.
  • The League of Extraordinary Gentlemen, being a Massive Multiplayer Crossover comic, frequently reveals characters from the various works it adapts to be relatives. Especially if they happen to share the same surname:
  • Shazam!: The Secret of the Freeman Brothers" in World's Finest #280 reveals that Quality Comics character Kid Eternity lives on Earth-S with the Fawcett characters and has the real name Kit Freeman; he's Freddy Freeman/Captain Marvel Jr's long-lost brother. This was probably undone by the Crisis, or at least glossed over in Eternity's Vertigo Comics book.

    Films — Animation 

    Films — Live Action 


    Live-Action TV 
  • Alice (1976): a crossover episode with The Dukes of Hazzard revealed Jolene and Boss Hogg were cousins.
  • Full House: DJ's friend Julie turns out to be the cousin of Steve Urkel from Family Matters. However, this was the only time Julie appeared on the show, so she wasn't an established character to begin with and was only there to set up the crossover.
  • The Green Hornet: In both the TV and radio versions, Britt Reid was confirmed as being the grandnephew of John Reid, the Lone Ranger.
  • 9-1-1: Lone Star: In the episode "Hold The Line", a crossover with parent series 9-1-1, Mateo asks the LA crew if they know his cousin Marvin, a minor character from 9-1-1's second season. This doubles as a reference to the fact that Mateo and Marvin are played by the same actor.
  • Once Upon a Time brings together multiple characters from classic Western fairytales and Disney animated films note , with an infamously twisted family tree of relationships:
    • With the Season 2 reveal that Rumplestiltskin's son is Henry's father, Rumplestiltskin is "in-laws" note  with Snow White and Prince Charming, Henry's biological grandparents, and the Evil Queen, Snow White's stepmother and Henry's adoptive mother. Once Belle from Beauty and the Beast marries Rumple and Snow White's daughter marries Captain Hook, the web of in-laws gets... extensive.
      Charming: It's a good thing we don't have Thanksgiving in our land because that dinner would suck.
    • The Evil Queen's mother would go on to become Wonderland's Queen of Hearts, and was also the Miller's Daughter from the Rumplestiltskin fairytale. The Wicked Witch of the West is later revealed to be the half-sister of the Evil Queen via the Queen of Hearts.
    • Peter Pan is Rumplestiltskin's father (though he didn't really become Pan until after Rumple was born).
    • The Snow Queen from the original Hans Christian Anderson fairytale is not only Elsa and Anna's aunt, but was once Emma's foster mother. Particularly amusing since Emma's birth mother is also called Snow.
    • After the Season 7 Time Skip, Henry has married and had a daughter with an alternate version of Cinderella, making Snow White and the Evil Queen this Cinderella's in-laws.
    • Also in Season 7, an alternate version of Rapunzel is revealed to be the Evil Stepmother to Henry's wife Cinderella, and an alternate Alice is revealed to be the daughter of the alternate Captain Hook.
  • Psych: The writers planned to have a crossover with Leverage with the reveal that Shawn and Henry were related to Elliott. (All three have the last name Spencer.) But then it was established that Leverage existed as a show in the Psych universe and those plans were abandoned.
  • Sesame Street: A 1991 five-part crossover special with the Israeli version of Sesame Street reveals that Oscar the Grouch and his Israeli counterpart are cousins.

    Newspaper Comics 
  • Hi and Lois: One strip makes reference to "Uncle Beetle" in the Army. Beetle Bailey and Hi and Lois were both created by Mort Walker. Beetle is Lois' younger brother.

    Professional Wrestling 
  • When The Muppets appeared on WWE Raw SuperShow, it was revealed that Sheamus (often mocked for his Beaker-like hairdo) was related to Beaker in an unspecified way when they got into a conversation and Sheamus said he'd be unable to make the family reunion, but asked Beaker to tell Aunt Teresa "Hello".


    Video Games 
  • Alice in the Mirrors of Albion, a game set in a Fairy Tale Free-for-All, turns the Little Red Riding Hood (named Letitia Redd) into the Mad Hatter's niece.
  • Dark Parables, being a Massive Multiplayer Crossover of fairy tales, does this to many of the classic characters. For example, it's revealed that Princess Briar Rose is the sister-in-law of The Frog Prince, who later married Cinderella, whose Fairy Godmother was the mother of Pinocchio.
  • Fate/Grand Order:
    • Though they lived centuries apart in their original lives, Arjuna and Minamoto no Raikou are half siblings. Arjuna's father is the Hindu God Indra and Raikou's father is the Shinto God Gozu Tennō, but in the Nasuverse, the two gods are one and the same.
    • It is revealed that Morgan Le Fay and the Lady of the Lake are split personalities of each other. This means the Lady of the Lake's adopted son, Lancelot, is the adopted sibling of Morgan's children Agravain, Gawain, Gaharis, Gareth, and Mordred.
  • HoloFunk 5.0: hololive idols Amane Kanata and Tokoyami Towa are revealed in sidestories and background details to be the first cousin and younger sister of Friday Night Funkin' protagonists Boyfriend and Girlfriend respectively. The sudden association is justified by both of the latter characters being rewritten into the street-smart Japanese angel and devil Kenji Tensei and Hana Kurayami, who publicly operate with false identities to hide themselves from Girlfriend/Hana's parents.

    Web Animation 


    Web Original 

    Web Videos 

    Western Animation 
  • The Care Bears: Adventure in Wonderland: The White Rabbit, whom Alice followed down the rabbit hole, turns out to be the uncle of Care Bear Cousin Swift Heart Rabbit. This is how the Care Bears are alerted to the situation in Wonderland.
  • Paradise PD: In a crossover episode with Brickleberry, Chief Randall Crawford from the former series is revealed to be the cousin of Woody Johnson from the latter.
  • Scooby-Doo and Guess Who?: Alfred Pennyworth is Daphne Blake's Honorary Uncle in the Batman crossover episode, "What a Night, For a Dark Knight!"
  • Teenage Mutant Ninja Turtles (2012): In the episode "Trans Dimensional Turtles", the turtles meet characters from the 1987 show, and it's revealed that 1987 Krang is the cousin of Kraang Sub-Prime.
  • Tiny Toon Adventures: Despite fans' beliefs to the contrary, only Gogo Dodo and the original Dodo from the classic short "Porky In WackyLand" are officially related as per Word Of God.
  • The Transformers: Earth Defense Command operative Marisa Fairborne, a close ally of the Autobots, is revealed to be the daughter of G.I. Joe operative Flint, who "appears" in the series via a Quintesson-created duplicate. The writers have confirmed that fellow Joe operative Lady Jaye is her biological mother.