K., ever have your mom tell you, "do not pick at it, you will make it worse? ".. This applies to your situation.. Leave them alone.
I completely understand you have some sort of guilt and feel an obligation, but these people have some major issues. Just because your husband was born into this family, does not make them good people.
I recall a time when my father were on the outs. He was an alcoholic, always angry.. selfish.. But I wanted to tell him I was getting married.. He acted a bit like an A$$. I said we are getting married , his fast answer was, "we have plans and do not have any money to give you".
I looked at him and said," well, we are not asking for money and we are not getting married for a year. Sorry you already have plans, but I just wanted to give you a heads up.. If you can make it, that would be nice, but if not, you will be missed. "
He attended but I did NOT ask him to walk me down the aisle..
But once he turned 60, he had finally gotten his act together.. It was different. He proved to all of us, he had gotten his life together, by living as a good person, admitting his mistakes and really trying to be a good person, ''At this point, these family members are car wrecks. You can love them, but you do not need them to be around. They are dealing with their own lives..
I have friends that are more like my family, than some of my closest family members. They have always been there when I needed them. They know I love them back. We do not judge each other, we can just be who we are warts and all and we still would do anything to help each other..
Those are the relationships that I want my daughter to be exposed to. She has her own group of friends that are like sisters to her.. I am thrilled to know if anything were to happen to me and my husband, she will never be alone. She will have my friends, my husbands friends. , and her friends, along with our relatives to depend on..
Go forward.. no guilt.. Things could change in the future and it wil be a wonderful surprise, if not.. the nuts in the family tree, will make good story telling in the future.