Ours liked the books by Sandra Boynton, they're silly rhyming books that helped Jr learn to read. For the 7, ours couldn't get enough of joke books around that age, Brenda Ponnay was a favorite, he liked the Bad Guys, Wayside School series, Nate the Great. My suggestion is whatever it is they like, get books related to that. We have tons of books that I would read to him, but reading on his own we let him grab what he wanted.