Faith and patience being tested. Please help...?

I'm going through a divorce. My husband was very dominating. He left, because I didn't like his group of friends and because the kids and I would not stop going to our church and going to his. He attends a church that believe that if you're not baptized in their church and attend their church then you're going to hell...Anyway, It was a list of control issues. I started standing up. I didn't inhibit him from hanging with his friends and attending his church, but at the same time, I had my own things going on. Anyways, throughout our marriage I have had trouble with his family. His mother was a trouble make and a back stabber... His brother is a child molester...Grant it, all families have problems, but these people are something else. Also, my soon to be ex seems to pick his friends that have things in common with his sick family. Anyway, last night the child molester brother starts haring my 19 year old daughter via cell phone. Today my boys whom are 14 and 10 tell me that when they went with their dad for a visit he made them talk to my mother-in-law though they didn't care to talk with her. I have a couple of questions about this. 1. How do I protect my kids from my ex's creepy friends and family and 2. I'm a Christian woman, but I can't seem to get the resentment I feel toward his mother out of my heart. His family put me through hell for 21 years and I still hold resentment. I don't like feeling this way, because I know it's not Christ-like. How do I let this go? Thanks very much