I had known his family for 17 yrs, when he walked out. I was friends with many of his relatives and there are a lot!
They have been asolutely fab, helping me in the last 4.5 yrs with the DCS, support, friendship, listened to me etc. I love them dearly.
OW and new his DP, wanted and demanded that all contact with me was cut and they had nothing to do with me. My MIL at 70 pointed out that her son could do what he liked but no one was going to dictate who she was going to be friends with and stop her seeing her DGCs.
The rest of his family said the same, she is welcome and we will treat her as we did you - but we are not being told who we can be friends with.
I am eternally grateful for the love and support my ex in laws have shown me - in the most traumatic period of my life. In the past 4 yrs, I faced the destruction of my marriage, accusations, my DCs were emotionally abused and driven out of their DFs life, my parents passed away, my sib was seriously ill, one of the DCS was seriously ill and ended up on intensive care and I had a major operation.
I would not have coped as well as I have it had not been for their unwavering support of the children and myself.
You need to find your place in the family and actually make an effort. Ex MIL, sent presents, cards for her and her children, went for coffee with her and her son and was ignored and never received a thankyou once. It set the tone for their relationship.