Huddy, I'm sorry to hear this. I agree with Job and would separate the 'belongings' issue with the Christmas issue. It is hard, but separation does also bring the aspect of dividing Xmas time in some way. We always found the best way was for one spouse to spend time with SS in the early part of the hols and the other in the later part.
We were always close enough to actually meet up on Xmas day if needed. Though some years, HXW1 chose to spend Xmas alone and SS was with us from Xmas Eve. If she wants to take them away for some of the time, perhaps you could agree to swap over sometime around Xmas, so that you can also enjoy the festivities with them?
To me, it would seem unreasonable for her to want to take them for the whole two weeks, but if she wants to visit her folks with them during the holidays, that doesn't seem unreasonable? Though I wouldn't expect that visit to span the whole Xmas period - ie: 23rd to 30th for example?
Do take some time and make sure you respond, rather than react to her unwelcome news.
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus