Boyfriend's difficult family?

My boyfriend and I have been together for over a year, and are very serious about each other. However, I have never met his mother or step-father due to the verbal and physical abuse (respectively) he suffered from them as a child (he's 20 now). He is still hurt and has some anger towards them. Recently, his step-father's brother started contacting me, the girlfriend, via Facebook. My boyfriend is very frustrated that I respond to his messages and wall-posts. Also, the step-father's brother, Bruce, wrote on my wall telling me that he talked to my boyfriend's mother (implying that it was a phone call he wanted to tell me about). Bruce is really pushing for a reconcile between my boyfriend and his mother and step-father... How should I handle this? I have a great relationship with my mom and step-father, so of course I want my boyfriend to have the same with his. Do I push him to forgive and try a fresh start with them? Do I form a relationship with them by myself? Do I cut off all ties with that part of his family?