karma If you honestly believe that the children do not suffer when their mother acts out of spite towards her XP, and uses the DC to make her XP suffer by missing out/losing out on seeing his DC for Christmas day, then nothing I can say will change your mind or make you reconsider. I can see that now.
To suggest that a woman is more equal has the edge as a parent because she carried the baby for 9 months, gave birth and breastfed the baby is bonkers imvho. The father could just as easily have suffered sleepless nights too.
Your posts radiate the message loud and clear that as far as you are concerned, mothers are superior parents compared to fathers, and their decisions should always always be the final word.
I feel mothers who think of and treat their XP's as second rate parents because of wrongs they have done to the mother, and refuse to send their DC to the XP for Christmas because in some weird way they feel it is justified because the XP treated the mother poorly are using their DC as emotional blackmail to punish the XP. (I hope these mothers realise it is their own children who are being punished by this too.)
If it matters so little to the children where they spend Christmas day when they are very young, why not just alternate it?? Oh yes, that's right, because the mother decides that her XP isn't worthy and doesn't deserve to see his DC on Christmas day because of the way he treated her!!
Mothers are not superior parents to fathers just because they gave birth. 
If you want your DC to grow up to believe their father is only worthy of their time if he placates his angry ex constantly, then there is nothing I can do to make you think about it, but I do..and will continue to feel extremely sad that there are mothers who draw their DC's into adult situations, adult emotional pain and hurt that the child needn't be aware of...ever.
Your comments have saddened me karma.
I shall now go back to banging my head against my brick wall, because your mind is made up, and you come across as very unlikely to change your mind. I hope your DC grow up to realise that a great number of people have been crap partners, but remain good parents.
Personally, my DD deserves more than to be used as a battering ram or a stick to beat my XP with, or to remind him every single year at Christmas of how shoddily he treated me. (I imagine that many many fathers denied the opportunity to see their DC on Xmas Day because of past hurts and pain they have caused the mother spend a large amount of the day feeling sad and contemplating this.) I do not need my DC to remind him of that, I am an adult and if I choose to, I can remind him of that myself.
My DD deserves the opportunity to spend Christmas with her father as much as she does to me, irrelevant of what my XP and I may have done/said to each other in the past. My DD deserves that, not my XP...my DD, and that's what Christmas is all about imo.