Our family isnt quite so complex (my dad lives 100s of miles away so wont see him) its just my PILs and my mum to think about.
My mum only has her BF so i feel a bit sorry for them being on their own BUT we dont like going to PILs so much as there's a lot of family on that side and so MIL tends to put on a buffet rather than sit down meal... and we really love a sit down meal on christmas day.
Last year we invited both sets of parents to our house for a sit down, but MIL broke her leg a week before Christmas and was housebound so in the end it was just us and my mum and her bf. It was nice enough but not sure i want to repeat it this year and not sure i want the expense of a full 3 course + booze & trimmings given our recent circumstance changes.
We used to alternate pre scarlett... 1yr my mum, 1yr on our own, 1 yr his parents, 1yr on our own etc... We have been keen to involve everyone since Scarlett but i think this year we may have christmas day on our own. Visit everyone in the morning as usual and then have a sit down dinner at home...
Probably then invite PIL, mum, B&SIL etc over on boxing day or go to PILs depending on everyones plans.
Usually love Christmas as its the only holiday DH really takes but this year it fills me with stress, hopefully if i find a job we will be a bit more comfortable - saying that, i could well end up working over the holidays