Aver, I just want to say that I know what you are going through. My x had a baby with the OW before we were even divorced and we were married for 18 years and together for 22 and it took 4 years to be divorced. I do not have to describe to you how difficult it was. What you can do with your MIL is never speak badly of her son. Always take the high road. Do your best. Keep it up. You will get there, but it is not easy and was very hard for me. That's the truth but you will get there. Take care of yourself and you will. Wonder
