Tp begin with, the boy's mother has no authority to say if the father can see or not see his own child. That is for the courts to decide, and if he has court ordered visitation then she cannot keep his son from him without being in violation of a court order.
Secondly, if the boy is physically abusing the little girl then something must be done. It's called tough love. If the father isn't comfortable punishing his son, then he needs to call the police. That might be the wake up call that both the boy and his mother need. (I am speaking of the biological parents of the boy here-- not the step mother.)
The father and step mother can also choose to see the boy at times and places where the little step sister is not present. Instead of having his over to stay at their home, they can arrange just to pick him up for a day outing or things like that.
Another option is to go to family therapy with the child.
There are other options as well.....
All in all, the father of the boy must take charge and start making decisions about his son. He has options. if he won't act, then the boy will continue to be out of hand. The only thing the step mother can do is to make sure that her daughter is not around during visitation. If necessary, maybe the little girl can go stay with a grandmother while the boy visits. The mother needs to protect her little girl by getting her out.
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