@Dan58,
I'm still trying to grasp the fact that someone would come out and say something like that. Who does that?? Did he say it to her, to the two of you, or the whole group?
I think you guys (or your wife, at any rate) needs some new friends.
Let me this straight, too. The sisters are about 10 years older than your wife - let's say they're 50. That makes your wife about 40. Their son is about 35. So... she was a teen when she had her son?