Am I supposed to reciprocate?
He lives with them - long story centred on his father's care needs. They quite often ask me to join them for dinner, which is always lovely, both food and company.
I live with my adult DC and BF stays with me a few nights a week.
Would it be usual (or weird?) for us to invite them back? I don't think they expect it, but not sure if I should or not. His Dad's condition makes food tricky and I know he doesn't like eating out. Mum always does something light that he can have a tiny portion of, but I could also do that.
Fwiw I've said BF because we don't live together and likely never will but this is an established relationship where we consider each other in all aspects of plans etc.