What would you do about this problem with your mother in law?

Okay, first off me and my b/f have been together for 8 years. Me and his mother have been decent to each other for those eight years. Yes, we fought and said some mean things, but never like this. It started b/c his 20 soon to be 21 year old brother was staying with us b/c she kicked him out, their other brother kicked him out and another borther would not let him stay. He's got a drinking problem and he doesn't do anything! He stayed for about 2 weeks...sleeping until 1, staying up all night on the computer, drinking, and eating all the food. We have 3 kids and i am expecting our fourth. We kicked him out. Told him he had to go. My b/f is a recovering alcholic (sp) so it was a problem with that also. Anyway, he came back and all of his stuff, a full two bags was sitting on the porch. their mother came, and my b/f was not home. just me and the youngest child. She started screaming at me to open the bleeping door. Then kicked it, tried to open the windows. Called me tons and tons of names and refused to leave when I asked her to. She then said that she knows I am not doing anything since I am unclean and a bad mom. I said whatever, I am shutting the door and she needs to leave. Up until then, I was going to blow it off since we have been here before. Now so far I have not said one mean thing or bad word or anything. She says she doesnt know why my b/f is with me, since all I do is cheat. He has cheated in the past and I have been faithful. She cheats on her hubby all the time. I said whatever I gotta go, my son's-her grandkid's b-day party is today and I have to get ready. He's real b-day was three days before this. She said that she didnt care it wasnt her grandkid, since its not his kid. Thats what got me. Then she said none of out kdis are her grandkids and went on and on about that.They are all his too, and he knows that. She then tried to get in the door again and I had to call the cops to get her to leave. Now, it's been three weeks and she is trying to "buy" my b/f back. Dropping off clothes for the kids, wanting to take them to the park,etc... I won't take the clothes or let them go. He says since it was said out of anger, I should just drop it. They have never even talked about that day. Oh, and I recorded everything she siad and did so i could prove it to him. I don't want anything to do with her. I said he could see her and talk to her and whatever since its his mom, but i would prefer the kids didn't. But let him decide that. He says I am being childish for holding this grudge.And she has just kicked him out again b/c of the same reasons we did. What do you think and what would you do?