This brings to mind a very important question - how did Harry learn to even mentally complain about how the Dursleys treat him? Most kids who are raised in an abusive home don't even know something's wrong until someone showed them. So who showed Harry?!?!
My All-time Favorite book from when I was a kid. I still have it! :D The Color Kittens by Margaret Wise Brown, Illustrated by Alice and Martin Provensen. Golden Press; NY, 1958; 1949 / via Calsidyrose on Flickr