Pam, sorry you are going through this. I think a lot of families go through similiar things when a parent dies. My brother tried to sue me when my Dad died - too long of a story. All he got was 2 or 3 different attorney bills. We were estranged for quite a few years, though I did keep in touch with his children. Just before he died in 2006 at 64 yo, we did talk, but he never said he was sorry for what he did to me and that was ok. I hated that he died. He was the master of his own undoing, but could not see it. Sad.
Hope things get better for you and your family.