My sister and I had a falling out but have since recovered. We have a family reunion/overnight camp out held every year. I live nearby and all camp gear is stored at my home and I am responsible for the initial set up. It is not a great expense and I can afford it, so I don't mind. There are anywhere from 20-35 people who attend. My family of four, and most of the rest are her children, grandchildren and their guests. I have never objected to her guests and welcome them (the more the merrier!).
Three years ago, I invited some of my nieces and nephews from my husband's side of the family to the camp out. My sister, who has always been very territorial, was upset, unhelpful, very argumentative and rude to me and my visiting family/guests. She indicated to her children that my guests didn't “belong" to our family, and therefore their presence was unwelcome and not necessary. She avoided me for two years.
After two years, she just decided that enough time had passed and probably hoped I had forgotten. She needed help and asked for my help, and I assisted since it was the right thing to do. That seemed to indicate to her that all was forgiven and she began to resume her relationship with me. I have never forgotten nor have I ever received an apology for her comments. Too much time has passed to have a meaningful conversation about what she said. I have chosen to try to get along. I understand that she has flaws (who doesn't?), and try to overlook those characteristics when we are together. Our relationship, once close, is now just polite. It works for now.