So he goes on holiday 3 times in a year, takes 12yo twice, and doesn't bother to even contemplate taking his other two or their feelings when they realise that the older sibling is being treated with favouritism?
Why the hell does he not book one holiday and take ALL kids together?????
Do the courts know about the favouritism? Do the courts also know that the 12yo is cherry picking where he lives based on the offer of holidays and that the father also kicks out a child because a holiday in September with his partner is far more important? And YOU allowed your 12yo to return to this pitiful of a dad because of the offer of a holiday?
Who is in charge here, you are the 12yo?????
- If you allowe our 12yo to choose where to live, he needs to make a choice and stick to it. Not move between the two because he doesn't like what the other does, offer etc at the time. Especially as he is at secondary school and as you said, live in a different borough. Not conducive to a stable environment.
- A written agreement should be in place that states that no child would go on holiday with either parent if the other child/ren are excluded - for whatever purpose. Especially financial. Most good parents wouldn't bother if not all theirs kids could be treated equally.
- Access arrangements are the pits. These kids don't seem to spend time together - two go to dad whilst one goes to mum. They need to be together so why can each parent not have all three togetheR. No reason, really. If you have three kids, you have three kids TOGETHER.
And yes, YANBU for not giving permission to ex. But why do you need reassurance when the courts have decided in your favour?
Your 12yo will kick off, inevitable, but considering you allow himself to move between parents because of the fancy of a holiday, shows you have little control over your child and his behaviour is probably the result of the sorry custody and access arrangement you have in place.
Part of me feels for you, really, but you need to toughen up a bit, not just with your ExH but your 12yo also.