Game of Thrones, Season 4

Jaime Lannister:
You'd condemn your own son to death?

Tywin Lannister:
I've condemned no-one. The trial is not over.

Jaime Lannister:
This isn't a trial, it's a farce! Cersei has manipulated everything and you know it!

Tywin Lannister:
I know nothing of the sort.

Jaime Lannister:
[angry] You've always hated Tyrion!

Tywin Lannister:
He killed his king-

Jaime Lannister:
As did I! Do you know the last order the Mad King gave me? To bring him your head! I saved your life so you could murder my brother?!

Tywin Lannister:
It won't be murder, it will be justice.

Jaime Lannister:
Justice?!

Tywin Lannister:
I'm performing my sworn duty as Hand of the King. If Tyrion is found guilty, he will be punished accordingly.

Jaime Lannister:
He'll be executed.

Tywin Lannister:
No, he'll be punished accordingly!

Jaime Lannister:
Once, you said family is what lives on. All that lives on. You told me about a dynasty that would last 1000 years. What happens to your dynasty when Tyrion dies? [gestures to his armour] I'm a Kingsguard, forbidden by oath to carry on the family line.

Tywin Lannister:
[dismissive] I'm well aware of your oath.

Jaime Lannister:
What happens to your name? Who carries the lion banner into future battles? Your nephews? Lancel Lannister?! Others whose names I don't even remember?!

Tywin Lannister:
What happens to my dynasty if I spare the life of my grandson's killer?!

Jaime Lannister:
It survives...through me. [Tywin looks shocked] I'll leave the Kingsguard, I'll take my place as your son and heir if you let Tyrion live.

Tywin Lannister:
Done. [Jaime is stunned] When the testimony is concluded and the guilty verdict rendered, Tyrion will be given the chance to speak. He'll plead for mercy, I'll allow him to join the Night's Watch. In three days times, he'll depart for Castle Black and live out his days at the Wall. You'll remove your white cloak immediately. You will leave King's Landing to assume your rightful place at Casterly Rock. You will marry a suitable woman, and father children named "Lannister". And you'll never turn your back on your family again.

Jaime Lannister:
You have my word.

Tywin Lannister:
And you have mine.