Tell them it's time they left to go to the happyhome where NO kids or animals will bother them! I'm in the same position... my neighbours are 87 and 85, i knew this before we moved here, so i have been keeping my son and dogs really quiet and out of their way, last week i met the old man, he did not even know we had dogs and a child...
A few houses down, theres an old woman living by herself, she is ALWAYS on my son's back, telling him my big dog barks and it bothers her
I told my son to tell her, next time he has to tell her to come and inform me about it (she's not been near me till now) she only "hears" the dog because she sees him walk the dog, she's just trying to cause trouble, i WISH she would come talk to me... i'm very ready for her!