If he has a bad anger problem and you can't talk to him about it then try talking to your mom and maybe the two of you'll can get him to see a counselor. Bad anger problems can lead to other things and you don't want that. Maybe he has a lot on his mind and every little thing sets him off, I don't know. But whatever the case may be, try to get him some help.
There really isn't an easy way to solve this. He needs counseling. That is the only sorta easy way to do this