Make him leave, if it takes calling the cops and landing him in jail everytime he comes around do it. If you are that scared, tell your dad, Your dad should help you find ways to be safe. And if he can not you need to find somewhere to be he does not know. He will eventually kill you or your child, people who have abuse problems lie much deeper than normal people know. Be strong. For yourself, and for your child. You are all you have, untill you let others know SOMETHING MUST BE DONE. You can be a mother on your own. Its harder (this I know). And emotional and stressful. But you will one day see the benefits out weigh any of those hard times! Good luck, my heart goes to you. As this is not okay! Please make sure he knows that to, call the police. DONT WARN HIM, just do it.