As iJeannie said, I'd really recommend that you talk to your mum. If she doesn't know how much your dad's behaviour is affecting you, then she can't really do anything to help. It's not fair that his behaviour is scaring you - and you need to let someone know how he makes you feel. Does he get angry when you do something wrong, or when you get in trouble, or is it just over little things? If he gets angry over everything, it could be that he has some anger problems, and again, you should talk to your mum and get her opinion - maybe she could help your dad get help if she agrees with you about his behaviour.
Good luck :)
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.:.Faut souffrir pour etre belle.:.
♥ hey there, delilah, what's it like in new york city?