We don't review children's books too often, but if you are looking for clean books for your younger children to read this summer, consider any of the following:
Junie B. Jones series
Katie Kazoo, Switcheroo series
Horrible Harry series
Little House on the Prairie series (these make great read-aloud-together books)
The Magic Treehouse series
Any of the Mrs. Piggle-Wiggle books
Arthur chapter books
