When we were growing up, my brother and I would fight a lot.
I've heard that's pretty natural actually, but when we were younger it always drove me crazy. Not because we weren't close, I didn't really care about that, but because my parents would always demand we be nicer to each other. Well, specifically, they yelled at me that I was too mean to him. I figured they were playing favourites, but looking back, we were very close in age, had similar interests, plus, we were little kids with awful tempers- we were bound to butt heads.
We would hit each other, a lot. I was bigger and stronger, but not by much. There's about two year's difference between us, so whenever I got a little bigger and tougher, he'd just have to wait a few months and eventually we'd be on the same playing field again.