Lord Of The Rings trilogy by Tolkien
Chronicles of Narnia, CS Lewis
Little Britches, Man Of The Family series, Ralph Moody
Little Women, Alcott (my dd only)
Illiad/Odyssey, Homer
Know What You Believe, Paul Little
I know this is more than 5. I could list more but I'll stop here. Why these books? Classics, thought-provoking.