It would annoy me also, but isn't it possible that the friend and his daughter would be alone? If he's a co-worker, maybe he and and your husband talked and your husband felt a little sorry for him?
I also read your other thread about your husband cancelling things...it sounded an awful lot like me (I have depression)...I think I would like to do things and I hope I can do them....but then I can't
Perhaps he has trouble communicating with you? It was difficult to tell my husband...I imagine it's worse when a man has to admit to a woman that he might be having trouble.
Honestly...he sounds like a decent guy who might need some help.
Just my opinion and view based on what I have read.