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Right now, my brothers usually are fighting. My oldest brother - 12 going on 13 - likes to beat up on them.
I believe it stems from insecurity and the need to prove that he isn't weak. He can't beat up his older sisters nor is he regarded as tough. He likes to prove dominance and possibly feels displaced that females can over power him.
I think he takes out his rage on them because that we can't be bothered and he feels very intimidated. He's constantly trying to prove that he can over power people and he might feel that he has to constantly assure his masculinity by beating up the other two. I think he believes that his masculinity is in trouble when girls can tell him what he can and can't do. Something really irks him about that.
Again, he does suffer from inferiority complexes and does think that he can do anything. When boys tell him something, he laughs it off. But with girl, he gets very upset. He is trying to find a way to assert masculinity over the others just to wipe away the anger of females. He is constantly trying to act out. He believes since they are smaller and are male, that he can prove that he is stronger.
This might be meaningless, but it's just a thought.
Still, no music.