I'm curious to hear from everyone out there about your favorite book. If you're a parent, what are your children's favorite books. Please identify best age range for the book you recommend.

The reason I'm gathering this info is that I have been helping a local pre-school get their libraries put together and wanted to double check for books that we might not already have. I am also doing research for the 3 manuscripts I'm working on and I want to see if my story structure and flow work with the desired age ranges.