I love reading the Harry Potter books with my kids. My son and I read them together and now he rereads them constantly. My daughter and I just started POA a few days ago.

Chronicles of Narnia (especially LWW) was a great one to read together. Bailey School Kids is a fun series, too. We like to debate if the monster was real each book.

I find myself buying my almost 13yo all my old favorites growing up. Holes, The Hatchet, The Outsiders, Jurassic Park.