My daughter's boyfriend always refers to my wife and me as Mrs. or Mr. when we are having a converstation as in "Thank you Mrs P for lovely meal" (he's very polite) I'm all for him calling us by our first names but my wife doesn't like the idea, she thinks its too casual and forward but doesn't like the Mrs. bit either. What do other people call their partner's parents? I never called my inlaws by their first names but thats going back 25 years so things might be different now.