just remember...a serial killer always starts with beating animals first..also,wife beaters,child beaters and molesters,etc.
they start on animals as they have no recourse...they can't speak and tell on them...i would say good for your mom...that evil boy child should never be allowed on the property again...and as for the idiot younger brother who blatantly allowed it...think...what will he allow next???? will he stand by as his friends beat or rape a young girl??? he needs to grow a spine....
he needs an education...maybe he needs to volunteer at a shelter...heavily supervised of course....he needs to learn responsibility for his actions...yay for mom...keep him in line!!!