I feel like the ex wife just uses my partner for childcare but he isn’t allowed special days like Christmas.
It used to be a more ad hoc arrangement, last year partner had them for a few days before Christmas (which fell over his weekend) then he went to see them Christmas morning and then had them a few days later. The year before I think he spent Christmas with them all at her mums house.
Bit of a difference where you imply he isn't allowed Christmas with them yet he has been with them? Is this the 3rd christmas they've been split up and your 3rd christmas with him?
she says it’s unfair that she won’t be able to see them over Christmas week at all. But during the school holidays my partner has them often for a week at a time.
So the has them for 3 weeks of the summer holidays, 1 week at Easter and 1 of the other 1 week half terms?
Why do you expect her to not see them at all over Christmas? Has your boyfriend asked her or told her the plans you've come up with? A sensible way to do it would be christmas eve day and night and christmas morning with parent 1 new years eve day and evening and new years day morning with parent 1 then christmas day afternoon and boxing day with parent 2 new year day pm and following day with parent 2 then swap each year. Normal contact on the days between
Christmas is a bit different but we can’t break up the week because of our plans the following week. So it’ll just end up with him not seeing the children at all other than his usual EOW. Sigh. you can't possibly be this annoyed because you've unilatelry decided to change plans, book a holiday and expect a mother to not see her children, all without discussing it first? You've also implied he doesn't see them at Christmas yet he has never gone a Christmas day without seeing them bur you're expecting their Mom to?
It seems that you're trying to control the puppet strings and that their arrangement has previously worked but you want to be on 50/50 to match your arrangement so you get lots of lovely child free time at your convenience.
How are his children being considered in this?