My School Books and Locker

I have 4 classes everyday at high school. We have the first 4 classes one day, then the last 4 classes the next day, and so on. I heard from a girl at the high school say that she doesn't even know where her locker is in the school because she carries her backpack from class to class. (She told a group of kids and me that when we went on the tour of the school.) This made me happy because then I wouldn't have to run to my locker as often, or at all! (I wouldn't be tardy as much ether.) The books is what got to me though, because I didn't want to carry all 8 around when I didn't need them. Mom told me that Jonathan (my cousin who goes to high school.) left the 4 books he didn't need at home, and not in his locker. Then, he put the books he needed for the next day in his backpack when he got home, so that's what I was gonna do. Well we all went to go get school supplies today, And when we showed dad all of it, we started a conversation about my soon to be school books. (I forget what I said to start it anyway.) Dad say that...no, scratch that, he DEMANDED that I leave the 4 books I don't need in my locker. I said "Why?" Then he said "Well what if they say we're going to have to cancel this class today because of such and such, so they're going to have this class today." I COULD NOT SPEAK!! I didn't know what to say! It was so ridiculous! Different people have different classes! "They wouldn't do that!" I finally said. Then, just like a little kid, he said "How do you know?" I complained that my locker was too small, (They're not even 10 inches wide! Measure how long 10 inches are! Not that long!) but he said that they will fit. I don't wanna go to my locker at all! He also said to bring books home if I had homework, and "What if you need a book that you don't have with you?" I don't wanna put 4 books in there! Let alone 8! (if I don't have homework) As soon as he left, I said "I'm gonna do it anyway." So who's idea is better? Mine or his?