Gilly I so understand why this is worrying you - you've always been the one in the family who pulls everything together and organises everybody else. But this year I really cannot imagine any of them are expecting you to be doing all the planning.
As others have said, your DD, Evie, your DF and DSis can all come to your house for the day, and they can sort it all out between them. You shouldn't have to do a thing, apart from sit down and enjoy the Christmas lunch that others have cooked for you, and that others will clear away and wash up afterwards, while you go to the hospital.
And who knows? Your DH could very well be much further along the road to recovery by then and the big black cloud you've been under will have shrivelled to almost nothing. We're all still rooting for him, as we have been for several weeks now, with regular prayers from all around the country. Keep hanging in there, it'll all work out, you'll see xx