Then put it on her, Patricias!

Didn't know that the wife controlled the cousin... he'll just sit there and act like he's oblivious to what's been going on. Most men will tell their wives to get out of another's couple's business when they see their wife butting in things.

Tell her you don't appreciate her comments and you prefer not to talk to as long as she has to be negative.
You know what you want to say. I think she'll leave you alone.