each state is differnt in the way they handle "domestic violence" I woould check with your local Family services office also, they may have ways to help.. LIke Kimmydawn said check around before doing anythign that might make him go away permemantly..

I know where I live in MO... they wll try to work with the parents first to get the child hlep, like half day thearpy and go home, or stay there overnight.

It is so hard to raise a child that is abusive, just keep your wits in check.. and above all, protect both of hte kids, not just one.. if he hits her do what ever you think is needed...