Well done, @AllyJay comeback!
Absolutely @Brownowl - what a complete prat. I am surprised his wife didn't jump in on him - but she is probably used to it! He could have just said "How are you going?" That would have been acceptable.
Is your husband really close to his family? (Not everyone is!) Maybe get him to ride 'gunshot' & ask them to contact HIM if they are thinking of visiting & NOT to just drop in - EVER. That way he can say 'yay or nay' and pick the setting for the meeting.
My SIL is a total prat as well - she upset me greatly some time ago and we hate how argumentative & nasty she is to her husband (hubby's twin) even in our presence - so she hasn't been inside our house since then - nearly 10 years now. We talk on the phone occasionally (when we have to) but I prefer to keep it to texts or emails as her 'chat' turns into 1hr! Ho Hum! Her husband (who also has dementia) comes up often with one of his sons (a 4hr trip each way) & we are organising that every 3-4 weeks now that hubby has been diagnosed with aggressive mets - but she will never step foot in our place (and preferably our town) again! I don't lose any sleep over it.
Take care, I hope you are feeling better now, chatting about it & I hope you can find a solution xxx