While I would love to pick up a man 17 years younger whenever I'm next in a position to date, I'd like to think I'd have the good judgement to classify my child-in-law's brother as off limits, no matter how well we get along. Yeah, it's not technically incest, but if I were in the position of saying "yeah, my brother is dating my wife's mother", I'd be feeling a little dubious about their judgment.

I'm wondering, though, was the boyfriend under the same restriction -- did the son-in-law tell his brother he couldn't see his niece?