Run..

You tell them that it's illegal to be married to one kid, let alone two. Then say, "but seriously, this is liable to end badly... err, unless this guy is in an open marriage. Errr...."

And then you realize that there is no way to probe for information without getting way more than you ever bargained for.

Bitch slap + ignore the guy :T

"What did you find in that cheat?"