I can empathize with him. My mom and dad divorced when I was 3. I didn’t get to know my real dad until 6 months before he passed at age 63 (liver failure, he was a life long alcoholic), and I haven’t spoken to my mom in 18 years and that was only for 2 years as my grandparents were dealing with health issues & lived with my wife and I, so we could take care of them. I hadn’t spoken to her for 15 years prior to that.
Sometimes you have to part ways with people who are a toxic presence…even family members. Will I attend her funeral? Doubtful. She didnt attend our daughters. Why would I attend hers.