for some 25 years your mother was her MIL and is the grandmother of her sons.
Your Xw has some good memories and bonding with her mil, so don't assume this has much to do with you'
and don't make it about you. Let them reconnect if they've been apart.
I hated the idea of losing all my inlaws if my h and I divorced.
My brother and his wife divorced a decade ago. She and I were like sisters and when he filed, I vowed to stay close. We have.
We vacation together every other year and speak often...my brother has never mentioned it bothering him.
IT is not about her hurting you. It's about YOUR MOM and HER relationships with the people in Her life...
I hope you'll read up on Cancer and Kubler Ross's book on Death and Dying. It helps a lot.
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016