Cersei and Jaime Lannister are twins and lovers. Yeah. They are Tywin Lannister's children and Tyrion's older siblings. Cersei is unhappily married to King. The Best (and Worst) Couples on Game of Thrones The fact that Kit Harington and Rose Leslie are dating in real life makes it even better. Witty Ygritte . Cersei and Jaime, the Lannister twins, are GoT's evil power couple. bedding their siblings and having sex with Wildlings in Game of Thrones - but In real life, Aidan is dating singer Camille O'Sullivan who has.