I am a Social Worker myself and it sounds like you have been doing everything you can. I wished I knew of something else to advise you to do. My daughter has a nine year old that back talks us both too and has hit and tries to hit us and she is worried about the effect it will have on her other sons which are twin boys, 8 months old. I know she can really sympathisize with you more than me. I am here to support her and currently we all live together but I was married to her Daddy all the time she was growing up and didn't divorce until she was almost 21.