Jaime Lannister, the unambitious
“No one ever asked me if I wanted to be Lord Commander of the Kingsguard, but it seems I am. I have a duty—" “
“You do.” Lord Tywin rose as well. “A duty to House Lannister. You are the heir to Casterly Rock….”
"NO!” Jaime had heard all that he could stand. No, more than he could stand. He was sick of it, sick of lords and lies, sick of his father, his sister, sick of the whole bloody business. “No. No. No. No. No….“
I just realized how unambitious is Jaime. He doesn’t lust for power or richnesses and contrary to what Tyrion thinks he doesn’t lust anymore for battle or glory.
That abridged quote above shows the first instance that a son or relative of Tywin Lanister openly defies him. Both Tyrion and Cersei were more accepting and both lust for power.