Good audiobooks to entertain both a 3.5 year old and 35 year old? Fantasy preferred, no sexual content or language, not too intense.

My family is going on a road trip at the end of July. Our tradition has been to listen to audiobooks for this yearly trip, and this is the first year our son (3.5) is old enough to really listen. Here's a bit about us: 3.5 year old boy: sensitive to scary events, but loves [...]