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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.
  • Brother–Sister Incest: Incest between siblings. (Despite the name, allows both hetero and same-sex incest.)
    • Big Brother Attraction: A younger sister is strongly attracted to her older brother.
    • Father, I Want to Marry My Brother: Little kids telling adults they want to marry a sibling.
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    • Little Sister Heroine: A little sister who is a love interest.
    • 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).
      • Flirty Stepsiblings: A relationship between people who are only related because their parents got together before they did.
    • Twincest: Incest between twins. Triplets, quads, etc. fall under Brother–Sister Incest.
  • Cast Incest: Actors who are lovers in real life playing relatives.
  • Creepy Uncle: An uncle with an incestuous interest in his niece or nephew.
  • Incest-ant Admirer: When one relative is attracted to the other, but the other is uninterested.
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  • Incest Subtext: Related characters have interactions that make them look like a couple.
  • Incest Yay Shipping: Fans ship characters who are related, especially twins.
  • Kissing Cousins: Incest between cousins.
  • My Own Grampa: Someone uses time travel and incest to become their own ancestor.
  • Parental Incest: Incest between a parent and offspring.
    • Lecherous Stepparent: A stepparent who is attracted to their stepchild.
    • Oedipus Complex: A child is attracted to one of their parents but hates the other.
    • Pervert Dad: A father who flirts with and/or acts pervy toward his kid, usually a teenage daughter.
    • Wife Husbandry: Raising someone so you can marry them once they're old enough.
  • Relative Error: Someone mistakes a relative for the person's significant other.
  • Royal Inbreeding: Royals only having sex with blood relatives to keep the bloodline pure (and all the bling and lands within the family).
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  • Screw Yourself: Someone has sex with their own clone or other perfectly identical Doppelgänger.
  • Surprise Incest: A character enters a relationship with someone, only to later find out they're long-lost relatives.
  • Villainous Incest: The villain bones a relative to show how vile and messed up he is.
    • Inbred and Evil: A villain who was conceived from an incestuous relationship.