Cersei Lannister: You don't know, do you? You never believed it. How is that possible? What am I saying? Of course it's possible. How can someone so consumed by the idea of his family have any conception what his actual family was doing? We were right there in front of you and you didn't see us. One look in the past 20 years, one real look at your own children and you would have known.
Tywin Lannister: Known what?
Cersei Lannister: Everything they say is true. About Jaime and me.
Tywin Lannister: No.
Cersei Lannister: Your legacy is a lie.
Tywin Lannister: No, no, no, no. I don't believe you.
Cersei Lannister: Yes, you do.