Ive name changed incase this is identifiable.
I have a 9yo DS. His dad and I split up when he was 6 months old, and he has been with his now wife since DS was 1. We all get on fairly well.
About 4 years ago, my son's stepmum started taking him to a martial arts class on a weekly basis. She also started having lessons herself so she could help him practice, which I obviously appreciate. I have never really been involved with it because it has very much been their 'thing' with DS and has always been done on their time with him. His stepmum takes him to 2 lessons a week and also practices at home with him. I should add that they have paid for all of this (I'm guessing actually his stepmum pays as she is the high earner).
Anyway, a few years later and it turns our DS is VERY good at this and has been invited to take place in a sort of showcase/tournament overseas in a city I have always wanted to visit. The event is on a weekend that DS is with me and my husband so I want us to take him and make a bit of a holiday out of it. We would also take my two younger daughters (who I have had with my current DH) and my mum who can babysit them when we watch the event.
When my ex told me the dates I said I would get back to him to let him know if we could swap weekends, and I have now let him know that actually DH and I will be taking DS. He has gotten really upset about it (apparently his wife, my son's stepmum, is in tears) as they wanted to be there to cheer him on. There are only 2 tickets allocated per child so we can't all go, and as well as we all get on I really wouldn't want to spend a whole 3 day even with them.
I honestly don't think I am doing anything wrong as it is my weekend with my DS and I am not obliged to swap. He has never competed in an event like this before and I think it's important for him to see his mum in the crowd cheering him on! But I mentioned this to my sister and she seems to think IABU and she has made me doubt myself. Should I be letting his dad and stepmum take him?