Physical & Emotional Abuse Support Group
Abuse is a general term for the treatment of someone that causes some kind of harm (to the abused person, to the abusers themselves, or to someone else) that is unlawful or wrongful. No one deserves abuse, period. Abuse can be emotional, physical, or sexual.
If not, I'm not sure how to break the cycle except to put your foot down and make sure he knows that he won't treat you like that. If he boss's you around you should firmly, but lovingly tell him that he won't get what he wants if he acts that way. ("give me a drink!" "Not until you can ask nicely") if he hits, then just like any other child, tell him what he did wrong and why and put him in time out for six minutes. He's young enough that the damage can be undone.