Season 4, Episode 10: The Children
Tywin sees the pointy end of Cersei’s emotional weaponry.
Cersei has had many pointed conversations throughout the series with her father, Tywin Lannister, about her position within King’s Landing, as well as within the family. So, when Tywin tells Cersei that she must marry Ser Loras in order to solidify the partnership between the Lannisters and the Tyrells, it’s just another slap in the face since it shows she’s just another pawn in a game played mostly by men. By now, she has already been in an unhappy marriage, and she’s not about to go into yet another one just because her father says so. She’s had it with the men in her life dictating the course of her already miserable existence, so in this moment, she has nothing to lose.
One thing that Cersei has always been pretty good at is knowing how to wound people emotionally and psychologically; she’s an emotional thinker, but not a very good strategic one. And here she stood in front of her father – a man whose driving force is the protection of the family name and legacy – and she knew exactly how to strip away the pride he had in the pristine Lannister bloodline. In a fit of anger and desperation, Cersei tells Tywin about the fact that she and Jaime lovers. And for the first time, she had Tywin’s attention. How he would deal with this ultimatum we would never know, because by episode’s end, Tyrion has done his sister a MASSIVE solid by offing Tywin via crossbow as he sits on the john. But it was a fine example of how Cersei strikes back when her back’s against the wall: with blunt, emotional force.