Also, we all have been going back through the beautifully done, My First Little House Books. They are an easy read for Michael, and Mark (3 yos) enjoys having them read to him. They have lovely artwork; some of the illustrations by Renee Graef; in other books in the series, Jody Wheeler. Our daughter loved these books when younger. (Until she graduated to the actual Little House on the Prairie books, and prequels).
Next, our daughter is currently reading through medieval histories; this includes Son of Charlemagne right now.