“No fair! She’s older! She knows more!” “No fair! He’s taller! He always wins!” What do you have when your two kids play competitive games together? Sibling rivalry. What do you have when they play this book’s games together? Sibling revelry! Here are games in which age, height, and such don’t confer an unfair advantage…or, in the case of school games, where the “teacher” is supposed to know more.