He looks at his sister with dissapointment much more openly than his father does. It comes from her sudden dissapearance off into sorneith's wilds. He wouldn't tell anyone, but his resentment toward her comes from paranoia that she'd get herself killed. She grew up sheltered, and he feared that she wasn't ready for the real world when she took off. He feared she'd try to take life all at once and it would bite her in the tail.

It didn't.
Somehow.

And now that she's back and incredibly happy with her lifestyle, he resents how much effort he put into being worried about her. He'd never tell Tevalk, but he does wish his mother had taken care of him instead of leaving him with Arico
He's also still trying to wrap his head around the fact she can be an aimless "druggie" and actually be completely fine.