KK,
This is difficult. Sometimes they make the decision for you or you have to do so. Sounds like you have come to some terms.
I have read a lot here, and realize I was lucky in lots of aspects with the in laws. They are/were great people, but my LH was an only child. Close to cousins growing up like siblings, but they all grew up and moved or started families. The nuclear family and their branch became more a priority than the big family celebrations. My LH loved his extended family, but noted as an adult, they never came to visit. He could see them, visit them, but one way.
So, after his death, mind you we were together 28 yrs total, most communication was FB. A few cards, no calls. No assistance otherwise, and they could have helped me or LH's mother a lot with their skills and finances. Nope.
I am not angry/hurt anymore. I am part of the family IF I go there and participate in their lives, but no reaching out to me.
MIL stayed here as she followed us. She has been helpful and involved, until I felt smothered. Started new relationship contact 2 years ago, and then, when dating, changed more. She has accepted it and has a new role in my life. She is not my best friend, and we do not have to do all kinds of things together, which is how the in-laws are. All things together, all the time She is moving when she can, makes her own choices about herself, and does not consult with me. She has changed our relationship, too.
It is sad, the collateral damage, I call it, from a loss, a hub in a family, the changes. Even with no drama or hurtful actions, there is still so much loss.
I am sorry you had to go through this, also.