I separated from my ex 1yr ago. Since then I have not seen or communicated with his sister who was a friend before I met him. There is NC with my ex. My choice, not his. The children do not want to see him and are old enough to decide this. Is there any point trying to repair the relationship with the sister? I suspect she has been told a pack of lies as to why our relationship broke down and that I am stopping him from seeing the children. If she hadn't been a friend before I met him I would just cut my losses, but we were close.