He needs some discipline.
Is Dad still in the picture? I see this sort of behavior a lot when he's not around. Your brother misses dad, isn't receiving attention in the form of discipline, and is angry at your mother because of it.
I would suggest getting him a mentor. I worked with a few kids who didn't have father figures, and it's an interesting experience to let them rage it out until they admit what's really bothering them. The toughest kids, crack the biggest when they finally come face to face with their problems. Many times they also heal the quickest. If he's acting out, he already feels that something is wrong, he just needs the proper motivation and help to fix it.
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Convictions are more dangerous enemies of truth than lies.
Frederich Nietzsche
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