He is a bastard born of INCEST.
Game of Thrones Season 4, Episode 6
that they are bastards
born of INCEST and adultery.
Game of Thrones Season 5, Episode 10
"the boy Joffrey, the boy Tommen,
and the girl Myrcella being born of INCEST
Game of Thrones Season 2, Episode 1
the product of INCEST?
Game of Thrones Season 4, Episode 6
and we're surprised
when the fruit of their INCEST is rotten?
Game of Thrones Season 2, Episode 5