So this year I ended an 8 year relationship with someone who was EA to me. I tried to stay for years, and was so worn down by him. The final moment was when he put me down in front of DC and I decided to leave. I'm so much happier now I'm on my own (it's been about 8 months), and I feel so much stronger.
He has a very lovely close knit family and lives with them at the moment. I live on my own in the family home (rented) with DC, and I do 95% childcare. He see's them when he can (maybe one evening a week comes here/ once every 2 weeks has them for a night.) When one is sick he will NEVER take a day off, it's all on me - when they've been in hospital this is also the case. Every school pick up/drop off...everything I do myself as I can't rely on him.
However, the guilt of hurting him and breaking up the family means I decided to offer him Christmas eve and Christmas day to spend with DC. As he doesn't see them as much as me, I felt it was the right thing to do as I know he's hurting that I left.
BUT, instead of accepting my offer he has now asked for them from the 22nd until Christmas day evening, and expects me to accept that, because he has the days off work and says next year his rota will probably be bad and he won't be able to see them as much. Just to note: I work for myself and am working all the time but took Christmas day and Boxing day off, that's it.
Surely I should be allowed to at least see my children on Christmas Eve morning. I'm already devastated that I won't be having them Christmas day, and I know that with his large family spoiling them, when they come back to me and we try and do our own little Christmas day on Boxing day, I just feel like they'll not be bothered/too tired and spoilt from the day before that they won't care. 
My sister has told me I was silly to give them up on Christmas - I don't have a close family really, so I could either go and visit my parents for the day (if they're even home, could be on holiday), or I plan to volunteer at a local homeless shelter, but it does mean coming back to an empty house alone.
Just wanted to see AIBU to want them Christmas eve morning at least? My sister says I should just cancel the offer and have them the whole of Christmas, but I feel now I've offered it I can't take it back. Is he being unreasonable to expect to take them for so long? I know he'll turn it on me when I respond saying no, so wanted to check what you guys think.