I am lucky enough to be able to go to DD's as we live fairly close. I usually arrive about 9.30/10.00 & leave about 3.00 just before she's thinking about kicking me out
. When DH was alive DM & Step-F used to drive down to us for Christmas & New Year (250 mile journey) until they felt the journey was too much. I hosted a big Family party on Boxing Day until 1st Grandchild arrived (Step-DH's DD & SiL's baby) . When DGS was 18 months old Boxing Day moved to Step-D's.
My DM is 90 & I last spent Christmas with her 7 years ago (she no longer travels far), DH was in Hospital & we went out for Christmas Day Lunch at a local pub, DH & I had done the same the year before.
DH & I spent several Christmas Days on our own after the AC had left home, we would never have expected them to be apart each going to their own Parents
My DM buys special foods for Christmas Day, very expensive but real treats which she enjoys, we make sure we all ring her, I ring before I leave for DD's & when I get home. It wouldn't bother me to stay at home alone but DD & DiL wouldn't allow that, it's lovely seeing DGSs open their presents. Treat Christmas Eve or Boxing Day as your family Christmas, new DG won't care & as they get older they actually love having more than one Christmas Day
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Family life evolves, join your Sister at the pub, volunteer or stay home whatever suits you. This year will start a new tradition which may evolve over time.
Vivonce don't leave again, we're all entitled to opinions, some are sympathetic, some not, some offer excellent advice, reflects real life