Between dp and myself we have 6 dcs (only 2 under 18 and they are dp's and live with their mum). My dc have always insisted on waking up with me on Xmas day and then I take them to see their dad that evening and they spend Xmas evening and Boxing Day with him.
This year, their father has asked that he have them for Xmas eve/Xmas morning (he has a family member who is v ill and may not last another Xmas and the kids are v fond of her so they are doing a special meal) but he also has a plan for Boxing Day and as we now live further apart, it makes sense they stay there and come to us on the 27th. We have discussed this (they are all over 18) and everyone is happy with this.
Dp's dc (11 and 8) spend Xmas with their mother - they live closer to us so there's a chance we can see them on Boxing Day.
However I was thinking of basically doing another Xmas on the 28th for all the dcs when they can all be with us. Do you think that's a bit sad? I've never had a Xmas day without any of them and it's suddenly made me a bit wobbly. I love doing a proper Xmas but I still feel it's really for the dc rather than me and dp!