It won't be long now before your son realizes his dad is beating mom to a pulp, and of course given the description you have offered, it could well be the son will witness dad killing mom during one of these beatings. Any man who beats a child's mother isn't a wonderful father. He's an abusive man who needs to be stopped. I hope someone on here can give you the reality check you need before an even greater tragedy than you are living now happens.