WikEd fancyquotesQuotesBug-silkHeadscratchersIcons-mini-icon extensionPlaying WithUseful NotesMagnifierAnalysisPhoto linkImage LinksHaiku-wide-iconHaikuLaconic
Two characters weren't related in the original work but they're related in the adaptation. Mind you, the two don't have to be biologically related. Adoption is perfectly valid for this trope to apply. What isn't valid is the characters now being in-laws or you writing a fanfic and making your two favourite characters be Like Brother and Sister, while still being unrelated and referring to themselves as honorary siblings, despite the fact that the two characters' canon personalities mean they wouldn't even go near each other if they could avoid it (you know who are). This can occur for a number of reasons:
  • It makes for a more pragmatic and realistic story. If Bob constantly stays over at Alice's house in the original, it's easier to just make them siblings in the new take on things.
  • The characters are very similar, be it due to their appearance and/or personality, and it just makes sense.
  • Making the older character related to a younger one takes out a good amount of the Unfortunate Implications.
  • Tie the characters together emotionally.
  • One of the characters is a Composite Character and this is a side-effect.

The opposite of this is, unsurprisingly, Unrelated in the Adaptation.

Examples of Related in the Adaptation include:

Comic Books

  • In DC Comics' New 52, Wonder Woman is the demigod daughter of Zeus and the aunt of Wonder Girl.
  • Might be a surprise considering what a hallmark of the comics it is, but Sif and Heimdall weren't related in the original myths, while the comics have almost iconically cast them as brother and sister.
  • In The Ultimates, Thanos is Ronan the Accuser's father.
  • In Transformers: Robots in Disguise, Galvatron and Arcee are twins. They don't look alike because, while Arcee was born male and near-identical to Galvs, she had a sex change and adopted her pink colours.


If we're honest, this trope is most prevalent in fanfictions. In Crossovers, this is usually done to quickly allow two different groups to quickly interact. In these cases, the characters are usually cousins. If the characters were played by the same actor, they're sometimes long-lost twins or just cousins who are able to pass off as twins.



  • As said below, after the 2007 Transformers movie, some writers refuse to even countenance the notion that Optimus Prime and Megatron aren't long-lost biological brothers.
    • Some Transformers Prime writers like to think that Optimus Prime and Ultra Magnus are brothers. Not a hard leap, considering how similar they look.
    • Starscream, Thundercracker, and Skywarp are usually written as brothers. When it comes to the other Seekers, Slipstream is the most common one to pop up as their sister, but it's not unheard of for Starscream to come from a large family.
  • Related to Alternative Character Interpretation, some fans took Keith's declaration of Shiro being his brother in Season 6 of Voltron: Legendary Defender literally and write the two as half-brothers.
  • Shows up a lot in works based off of My Little Pony: Friendship Is Magic. The most common are making Twilight a surrogate mother to Spike, Rainbow and Scootaloo being sisters (adopted or biological), Sunset Shimmer having been adopted by Celestia, and the Dazzlings being sisters.
  • Hermione can sometimes be revealed as a descendent of Rowena Ravenclaw (completely missing the point of Hermione's character) or a distant relation to the Malfoys. The latter usually pops up in Draco/Hermione fics.
  • In many Time Lady!Rose fanfics, Rose, or Arkytior ("Rose" in Gallifreyan), is the Master's sister.
    • In some Time Lady!Clara fanfics, Time Lady!Sarah Jane can show up as her mother.
  • In Human!AU Steven Universe fics, Amethyst and Jasper will often be biological sisters.
  • In the Danganronpa 2: Goodbye Despair fanfic New Island Life, Kazuichi Souda and Hiyoko Saionji are cousins, with Hiyoko's father and Kazuichi's mother being brother and sister.
  • In the Sailor Moon fic series Sailor Scout Sacrifice, Minako and Motoki are brother and sister.
    • Several fics back in the day used to make Rei and Mamoru siblings or even twins in the Silver Millenium. One fic even had them discover this as their present-day selves, resulting in a horrified reaction when they remembered that they'd almost had sex once. (They got over it quickly enough, though, and embraced the idea of being family.)


  • In Dr. Who and the Daleks, Barbara is both Dr. Who's granddaughter and Susan's older sister.
  • Anna and Elsa in Frozen. In the original work, Gerda and the Snow Queen were not only not related, along with it being hinted that the Snow Queen wasn't even human, but they were implied to be lovers. While Anna and Elsa were originally unrelated, Disney ultimately wound up going for the sisters route.
    • For what it's worth, the fandom readily embraced the idea of the Queen and the Muggle Best Friend being lovers.
  • One of the most criticized, and notable, aspects of Hercules is that Hera is the hero's biological mother.
  • Ariel and Ursula (maybe) in The Little Mermaid. In the original text, the Sea Witch was totally neutral and had no ties to anyone under the sea. In some early drafts of the film, Ursula was Ariel's evil aunt and this sometimes pops up in ancillary media.
  • Marvel Cinematic Universe:
    • In order to avoid paying the Sax Rohmer estate (and in order to avoid using a character riddled with Unfortunate Implications), the Mandarin will take Fu Manchu's place in Shang-Chi and the Legend of the Ten Rings as Shang-Chi's Archnemesis Dad.
    • Erik Killmonger is Black Panther's paternal cousin.
    • Egghead is Ghost's father in Ant-Man and The Wasp.
    • Tony and Howard Stark is an interesting case. Tony is Howard's biological son but after the films came out, Tony was revealed to be Howard's adopted son. Absolutely no piece of media has ever touched this.
    • Peter Quill is still a Half-Human Hybrid, but this time around, his father is Ego the Living Planet, not J'Son of the Spartax.
    • Hela is a twist on this. Here, she's presented as Odin's biological daughter, making her related to both him and Thor, but making her unrelated to Loki, who is her biological father is the comics and the original myths. This was presumably done to avoid using the Angela character, whose movie rights are most likely tied to the Spawn movie rights.
    • In the comics, Nebula claimed to be Thanos' granddaughter, a statement that was never proven but was likewise never disproven. Here, she's firmly established as his "adopted" daughter. The same for the Black Order. They were always associated with Thanos in the comics, but this is where they became "family".
      • Likewise, Corvus Glaive and Cull Obsidian (the renamed Black Dwarf) are confirmed by Word of God to be biological siblings.
  • In the book, Wilbur and Lewis are best friends. In Meet the Robinsons, Wilbur is Lewis' Kid From the Future.
  • Rudolph the Red-Nosed Reindeer had no stated parents in the original text. In the iconic Rankin/Bass Productions special, he's Donner's son.
  • Transformers might have been leaning towards this. At the end of the film, Optimus refers to Megatron as his brother. Later media made it very clear that Optimus was speaking figuratively, but some early ancillary media related to the film cast them as biological brothers.
  • In X-Men: First Class, Mystique is retconned into being Charles Xavier's adoptive sister. Not only does this relationship not exist in the comics, it didn't even exist in the movies before First Class.

Live-Action TV

  • In Jessica Jones, the hero is the adopted sister of Patsy Walker, a character that she barely ever interacted with in the comics.
  • In Merlin, Morgana is still Arthur's half-sister but their shared parent is Uther, not Igraine. By consequence, Unrelated in the Adaptation applies to Morgana and Igraine.
  • In Riverdale, the Blossoms and the Coopers are related, specifically Betty and Cheryl are third cousins, owing to both girls' great-grandfathers having been brothers.
  • In Supergirl, General Non is the eponymous heroine's uncle. Albeit not a blood relative.

Western Animation

  • Rarity and Sweetie Belle in My Little Pony: Friendship Is Magic.
  • In the Silver Surfer animated series, Thanos is the Mentor's brother rather than his son. Hand to god, this is due to a typo.
  • In The Spectacular Spider-Man, the random mugger that killed Uncle Ben is Black Cat's father which makes him a Composite Character with The Cat.
  • Believe it or not, the Thirteen Primes in Transformers. Prima, Vector Prime, Alpha Trion, Nexus Prime, the Fallen, and the Liege Maximo were all quasi-divine Cybertronians but unconnected to one another. When the idea of the Thirteen began to come together, these characters were assigned to the group.
    • The same actually goes for Primus and Unicron. In the original comic, Unicron came first and Primus was an unconnected entity born to oppose him. Every other adaptation casts them as twin brothers.
  • As a result of Composite Character, Haggar in Voltron: Legendary Defender is Lotor's mother.
Community content is available under CC-BY-SA unless otherwise noted.