I can't see the problem, really. I may be missing something, but you are getting meals cooked for you and delivered, spending the day with your husband, which is presumably the usual arrangement, and having one guest, who is family so can probably be asked to help herself.
What sort of fetching and carrying are you expecting to have to do? The food has been done, so there's only likely to be drinks afterwards if you all retire to the sitting room with a bottle of your favourite tipple. You could always give the others a bottle each, so that they can pour their own, if getting up to refill their glasses seems like hard work. Washing up for three with no pans doesn't strike me as onerous, particularly as there will be no pots and pans.
What am I missing?