A Corner of the Universe

This was one of my absolute favourite books when I was younger, but I sold off my paperback ages ago (along with Holes). Kind of regret it.

Hattie suddenly discovers she has an uncle
she's never heard about when Adam returns
home. But Adam is not just any regular
uncle; Adam, she is told, is mentally ill.
Adam is loud and enthusiastic and repeats
things over and over and quotes continually
from I Love Lucy. And, in addition, Adam
lifts the corners of Hattie's universe.
Recommended.