While his brother is quiet, Vash is tense. Muscles ready to spring to the defence of his kids. Logically, he knows Knives won't hurt them, but after years of torture that started with Knives throwing his lover to wolves for disobedience? He can't relax.

Even after he's told to go to bed. It takes several long moments before Vash begins to relax enough to sleep. "Yes, sir."