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Incest Is Relative

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"The family that LAYS together STAYS together!"
— caption of an unbelievably NSFW comic by Robert Crumb

Tropes relating to incest and its various permutations.


  • Alternate Self Shipping: Shipping a character with an alternate duplicate of themself.
  • Big Brother Attraction: A younger sister is strongly attracted to her older brother.
  • Cast Incest: Actors who are lovers in real life playing relatives.
  • Father, I Want to Marry My Brother: Little kids telling adults they want to marry a sibling.
  • Inbred and Evil: A villain who was conceived from an incestuous relationship.
  • Incest-ant Admirer: When one relative is attracted to the other, but the other is uninterested.
  • Incest Subtext: Related characters have interactions that make them look like a couple.
  • Incestuous Casting: Actors who are relatives in real life playing lovers.
  • Incest Yay Shipping: Fans ship characters who are related, especially twins.
  • Little Sister Heroine: A little sister who is a love interest.
  • Mistaken for Incest: A duo is mistaken for an incestuous couple, but are not.
  • My Own Grampa: Someone uses time travel and incest to become their own ancestor.
  • My Sister Is Off-Limits: A brother who bars anyone from dating his sister. May or may not be the result of him having a crush on her himself.
  • Not Blood Siblings: It's considered okay for them to have sex if they're not biologically related (although in some cases it's still considered wrong or icky, especially if they were raised as siblings).
  • Psychosexual Horror: A subgenre that explores psychosexual development as a subject matter, including themes of sexual development and sexual activities.
  • Relative Error: Someone mistakes a relative for the person's significant other.
  • Surprise Incest: A character enters a relationship with someone, only to later find out they're long-lost relatives.
  • Wife Husbandry: Raising someone so you can marry them once they're old enough.

Demographics incest is associated with

Types of kin