Well of course the uncle is a bit awkward... the guy's been alone for a while, it seems.
And then, he suddenly gets two new family members, adolescents at that, who wouldn't be awkward in that situation.
But damn, I like the fact that her efforts and cheeriness melts cold hearts. First her adoptive brother, then her new uncle... even though she doesn't seem to realise it.
It's good to see a naïve girls efforts not go to waste for once.