I am in a very similar place to the OP, my sister and I had a big fall out about 2years ago and had not spoken since. I have to admit, my life has felt a lot less stressful since not having her directly in my life. I have kept up to date on how she has been via rest of family, including my daughters. Recently she got told she needed a second mastectomy, and although I was very selfishly glad I wasn’t going to be her ‘go to’ for support, I was still upset about it and knew she would be very scared. After talking to her son and one of our nieces I wrote her a very short email, saying that I had heard what had happened and that I was thinking of her. I didn’t expect an answer, but after about a week or so she sent me a long message about what had been happening. She did get a big scare after her operation and ended up in Intensive Care. We now have a tentative friendship again and contact each other now and again. Not sure how it will pan out, will just have to see. But am glad we are on speaking terms again, just don’t want to get too involved in her life like I was before.