I need advice on how to how to handle issues with my Adult SD and her mother. Keep in mind I have no children of my own. I have been with her father since she was 15 (she is now 22). I have known her though since the day she was born. My SS (24) I have no personal issues with. I tried for the most part to get along with my SD. We would go shopping out to lunch ,etc. Her mother was very jealous (or so I was told) of this fact but I never ever tried to replace her mother.