It's tricky to get them to stop fighting, screaming and hitting you. I have now accepted it as daily routine. My wife has 4 sons aged 17, 14, 10 and 4 and they all resent me as the step dad and show no respect. They also fight amongst themselves and breaking this up leads to the odd right hook and punch or slap.
When did this start? In the first place, what on earth happened to your child the VERY first time they hit and screamed at you? What does dad do when they act like this?