As it is often pointed out here, MLC = confusion. You can't believe half of what they say and the other half......well let's say you may not be able to believe that either.
The excuses, the justifications, the reasons they use to try to convince themselves that they are doing the RIGHT thing will NEVER make sense to anyone else. It has taken me a LONG time to realize that I will never understand, and now must accept.
I think of all of the spew my wasband used before and right after he moved out, and there is no way - in a million years - that I could ever believe it and knowing who he is (or had always been) I still can't believe it came from him (thus the alien invasion theory is alive in my book).
My H is an only child, and his father died about a year after we were married (almost 25 years ago), so there isn't much of H's family in my sitch In the beginning my MIL turned to me to try to help understand what was going on - he had turned his back on her and had gone over 7 months without any contact. I did my best to comfort her and explained that I thought he was going through "something." I told her that I still loved him and planned to see this through. Three years later and she has closed herself off from me as he is letting her back in to his life. It's ok. I know it's not easy for her as well, but his family is HIS family and I respect that. I didn't tell her about his A - and won't. Hopefully you can get the help and insight you need here and others will weigh in on the extended family part of this.
You seem to be making great progress focusing on you and your goals. Remember to just continue to be the best YOU that you can be, for YOU and your kids and you will not have any regrets.
"Do not look back in anger or forward in fear, but around in awareness." - James Thurber