I have a daughter and separated from her dad after finding out about his affairs and that he had another child. He is not together with the mum but takes our daughter to see her sister once a fortnight. It’s her sisters birthdays and she’s been invited to her party but my ex has said he isn’t going. I think this is because her mum has a new partner but I don’t know for sure his reasons. My daughter has asked if I will take her and I would (I’m on good terms with the mum, we were both basically duped by him and our children are sisters) but it’s on the day my ex has my daughter. Do I just let it go and she misses her sisters birthday party? I think that will have to happen as I don’t want to try and help and be accused of interfering. Just wondering peoples thoughts?