Warning: Spoilers Ahead.
Relatives getting mistaken for Love Interests in Comic Books.
- Archie Comics: One comic has Archie and Reggie seeing Veronica hanging around with a hot guy. They jealously assume he's competition and spend the story trying to one-up him. In the end, when they're caught, a decidedly unimpressed Veronica informs them that the guy they saw her with was actually her cousin.
- Batman had an example in the Golden Age, with the King of Cats, Catwoman's brother.
- The Sandman: Endless Nights: In the story "Destruction - On the Peninsula", Destruction and his sister Delirium wander near an archeology team's dig site. One member of the team assumes they are a couple and derisively says he's too old for her, while another member assumes they are father and daughter. One member, Rachel, talks to both of them and finds out they are siblings.
- In Star Wars: Invasion, Finn Galfridian assumed Jaina Solo and her brother Jacen were a couple.
- Superman:
- Superman and Supergirl are cousins and they are (usually) extremely close as the last Kryptonians and each other's only (living) biological family. They are so close that people unaware of their kinship assume that they are lovers. Some examples:
- In Action Comics #500: The Life Story of Superman Superman explains to several fans how he came to Earth, became a hero, met his cousin... A member of the audience then blurts out: "I never knew Supergirl was your cousin — I guess I always thought she was your girlfriend!"
- In Supergirl (1982) #20, Linda Danvers (Supergirl's secret identity) tells her friend Joan that she's got a date for lunch with Clark Kent. When Joan starts gushing about her hot date, Linda explains that Clark is her cousin.Linda: 'Fraid you're on your own today, Joanie. I've got a date for lunch.
Joan: With the gorgeous Mr. Philip Decker, I presume—?
Linda: Nope. A different man... named Clark Kent.
Joan: Clark Kent... THE Clark Kent, the news guy from GBS?! Don't you ever see guys who aren't nationally famous?
Linda: Relax, Joan. Clark's my cousin! - In Supergirl (2011) #34 (a Superman: Doomed tie-in), a guy asks Supergirl whether she's Superman's girlfriend.Michael: I mean, I don't know exactly how you and Superman are connected, but I can tell he matters to you. He's... What? Your brother? Your boyfriend...?
Supergirl: ... My cousin. - Last Daughter of Krypton: After seeing Kara in action, Symon Tycho remarks her physiology, costume and even chest insignia are similar to Superman's, and he wonders if she is his ex-girlfriend.Simon Tycho: I'm starting to think the symbol she's wearing isn't a coincidence. Is she related to Superman somehow? Sister? Maybe an ex-girlfriend?
- This, along with an extra serving of Mistaken for Gay, happens to brothers Cyclops and Havok in an issue of X-Factor.
