What you have is good, I’m mostly just focusing on how the lines flow/sound themselves. Maybe something like:
“You were right. Your parents were nobody. But they had no part in your conception.”
“Don’t!”
“You’re so much like my grandfather…"
“I don’t want this!”
“…destined to rule.”
You’re right, the hangar paragraph can be reverted. I think “You were his chosen heir…” sounds a little bit better, though.