You sound like my late mother-in-law. Like your DIL, whom you don't seem to like much, my MIL used to want us t stay overnight there after birthdays, parties, any bloody occasion - we never did, as I preferred my own house, bed and routine.
Don't make this all about what YOU want, what YOU feel, or your son and his wife will see less and less of you.
I've been a very different MIL to the one you are (and the one I had). It pays off to let your adult children live their lives the way they choose. Back off and be a bigger person.