https://www.cathinfo.com/catholic-living-in-the-modern-world/advice-for-dealing-with-others-in-co-habitation-or-divorce-and-remarriage/

My own sister went black sheep about 20 years ago. She was raised traditional Catholic, and was married in the Church, the Indult. She married a 25 year old methodist when she was 18. They had 4 kids in quick succession, and then apparently the man decided he didn't want any more kids so he made his wife sleep on the couch as it were. As her emotional needs weren't being met, she eventually strayed and ended up having 2 more kids with man #2. Then he ghosted her, and she ended up with a third guy, some protestant, who she is with to the present day.
My other sister still talks to her a bit, but I haven't talked to her since I wrote to her about her first marriage situation. It's sad to be cut off from family members.

As for the rest of my family, most of my father's side I haven't seen in years. They weren't living Catholic or going to church to begin with, so after my grandparents died, I stopped seeing them. It's not like they were hosting any social events on their own anyhow. Our lives just didn't match up at all. While my grandparents were alive, they were the focus of family togetherness, at least for staying acquainted. My mother's side fared much better, as they were all practicing Catholic or even traditional. Only geography keeps me apart from them.