Tywin Lannister: You’ll kill your own father in the privy? No. You’re my son. Now, enough of this nonsense.
Tyrion Lannister: I am your son and you sentenced me to die. You knew I didn’t poison Joffrey, but you sentenced me all the same. Why?
Tywin Lannister: Enough. We’ll go back to my chambers and speak with some dignity.
Tyrion Lannister: I can’t go back there. She’s in there.
Tywin Lannister: You’re afraid of a dead whore? (Tyrion shoots him) You shot me. You’re no son of mine.
Tyrion Lannister: I am your son. I have always been your son. (Tyrion shoots him in the heart)
From Game of Thrones – Season 4 Episode 10: ‘The Children’ (4×10)