Try and be friends with the wife.
Let her know when you are going to the store,
if she would like to go with you, or have you pick
something up for her. At their age it's a tuff one.
But if you shower the wife with kindness, it might
rub off on her husband. We had the same problem a
few years back. Next thing I knew she was baking
the kids cookies. They have both passed away, and
I do find myself missing them. Best of luck to ya!