I love my fiance and his family save for his sister...I really feel sad for her because she has no idea how big of a ____ she can be. (maybe she does) She repeatedly shows how inconsiderate and self-centered she can be on every occasion that I'm around her. My poor fiance is at a loss when it comes to her. He feels like well she's my baby sister and she has had it rough (their mom passed away when they were teenagers) But I feel like its BS I've had friends who's parents also passed when they were young. Some have had broken homes, parents who abused alchohol, and some that didnt even realize they were parents...and they turned out to be great hard working women some doing an excellent job taking care of their own families now. So I feel like he and his dad (my future father-n-law) are making excuses for her selfish and crude behavior. The fiance wants her to be a bridesmaid in the wedding party and I am feeling extremely indifferent about it and he knows it but the relationship is between him and her not me. I cant not like her for the stuff she does to him if he continues to allow it. Is there anything I can do?