My 5year old son keeps hurting his two year old brother and kids in school for no reason I don't know what else to do. I have tried time out, taking toys. I have already had to meet with the school's principal for his behavior the principal told me that he is very aggressive and hes been hitting kids in the chest, shoving them out of the lunch line, and shoving them at recess. He got kicked off the bus for punching a boy in the mouth and busted his lip. One time he hurt his 2 year old brother so bad he couldn't walk for two days. The principal even took his privillages away nonthing works. I am scared that he is going to hurt someone real bad. What can I do to get my son out of this?