>You say "my mother-in-law's house in nice" because the whole term 'mother-in-law' is the noun BUT If mother-in-law is really a noun then why isn't it mother-in-laws (instead of mothers-in-law) when referring to the mom on both sides of the family. And is it mothers-in-law's houses or mother-in-laws' houses.

Moot point. If you have more than one mother-in-law you have a LOT more to worry about than where to put a little old apostrophe or -s for pluralization.

It was bigamy to bring that up!


TEd