Should I contribute financially and continue relationship?

My Mother has shun me, my Daughters, and husband but has no reason to do so. My Mom's grandson was accused of molesting a girl, denied it, and then avoided answering any questions. Through the years I knew he was guilty and I refused to let my girls/family around him. My mom feel I should forget about it and apologize for my actions.my actions involved asking questions. Since all this happened my mother has shun us, had family events behind my back, and tried to get in my business. When I try to talk to her about it she says in crazy. I hate that we all have no relationship but she has made it clear that on Mother's Day , thanksgiving , & Christmas she wants us nowhere around. Things have been happening in the family but she shares nothing.They will lie about taking family trips together as my mother pays. She constantly gives money to all of them and is hateful to me. I don't care about the money. My question is if she needs to go in a home or receive care my sister would not have the money to help. She could possibly not be educated to handle questions that arise. I know they don't want me around so do I break ties now ? What do I do when they need money or someone to care for her? I don't feel I should provide this. I send her gifts and respect her but I don't feel it is right to support after all she has put me through. I and my family have received the ultimate pain to me I no longer seem to have a mom