Ser Jaime Lannister is a fictional character from George R.R. Martin's A Song of Ice and Fire, and it's HBO television adaptation, A Game of Thrones. Jaime was the elder son of Lord Tywin Lannister, younger twin brother of Queen Cersei, and older brother of Tyrion. He was involved in an incestuous relationship with Cersei, and unknown to most, he was the biological father of her three bastard children, Joffrey, Myrcella, and Tommen, as well as her unborn child. Jaime is portrayed on the television series by Nikolaj Coster-Waldau