I ended up cooking the whole damn meal (MIL did ask if I'd mind, which I didn't but I expected more help from the rest of the family - which never surfaced

).
We had roast chicken, mashed potatoes, scalloped potatoes, 4 boiled new potatoes for BIL who is a pain in the ars*, savoy cabbage with bacon, broccoli and carrots, peas, a green salad, and sprouts which MIL did. Apple crumble for dessert. Pretty boring IMO but it was what I had to work with. Can't wait to be in the US next year and have a more interesting meal.