He grunts and pushes himself up, ignoring her arm, and finally coming to stand in the sacrophagus.

Looking down at her, and then around, taking in the view of the Lonely Mountain returned to its old glory all around him.

A single tear might be rolling down his cheek, no, not literally but... that's the expression. It takes a whole minute or two before he looks back at her.

"Why do you think that I am your great-uncle?" Did Bilbo.. no, he can't really find an explanation that works that way, in any way.