We had our second son on monday. 
With his EDD on Boxing Day, Christmas this year was always going to be a bit hit and miss. Both sets of grandparents would be welcome for Christmas Day, but things are Complicated.
PIL have dogs that they are mysteriously reluctant to leave with friends or kennels. They usually drive down with a caravan and stay in that when they visit, but the snow means they can't actually get it down their trackway. 
If they do come, it will literally be for 2 hours or less, after a drive (in their car, without caravan) of 4 hours. They will have to leave by 2.
My own parents have cats who need insulin injections for diabetes every evening. My dad does this. They are also reluctant to drive in icy conditions in the dark, though live a lot closer - an hour or so away. They are also trying to get their very cluttered house ready for my brother, who's flying over to stay on the 27th. My mum has started making noises about not coming out again until he's here.
Our real and selfish needs are for just one set of grandparents to be here for more than a couple of hours and to give DS1 some fuss and attention while DH cooks and I feed round the clock, hold the baby etc. DS is 2.10 and finding this transition to Big Brother rather hard.
PIL have just announced that they are coming on Christmas Day but only for 2 hours max and are bringing their own food (in previous lightning visits, this has been sandwiches). 
I know they desperately want to see the new baby and of course they must do, but AIBU to wish that if they could only come for an hour or two, it could be on another day? We will be cooking our joint of beef and other festive stuff anyway but they don't want to 'get in the way' ( tis Christmas ffs.) and I can see us just sitting down to our lovely meal just as they get up after their sarnies. It's not Right, is it?
A lot has to do with a window in the weather and traffic, as they are convinced the 25th is the only day they can drive down when the roads will be clear.
Ok, so to avoid the disruption of our own family day on the 25th, AIBU to declare Christmas Eve, Christmas Day and do the roast, most presents etc then? DS1 won't know! Then we can have cold beef, etc with PIL when they arrive - much nicer than dry sandwiches and faster to prepare. PIL will be very about it, esp if DS1 opens his pressies tomorrow, because they have set ideas about Christmas. (don't ask me about last year...)
Oh shite. I know we were always going to have to be flexible this year, but it feels like we're flexing round other people, not the other way round, and I did just push a baby out, dammit!