C.O.
sounds like you need to have a POW-WOW/Get together to find out who said what to whom and clear the air...
this is the best example I can EVER give of NOT saying anything to ANYONE you wouldn't say to someone's face...sorry - but if you can't say it to your BIL, MIL or FIL - or your husband - then you shouldn't be saying it all....you need to clear the air with ALL of them...
Guess this also means that you know who your friends are and aren't....
if your BIL has "influence" over your husband - then you need to make your marriage right.