Ddogs, for what its worth, I wish I could have been there to see the expression on your wife's GFs face. That is right before she vomited....
I havent read the book yet but completely agree that friends/family can be instrumental in the destruction of a relationship. I know that one of my wife's closest friends (her cousin) told my wife that she didnt like me from day 1. My wife's cousin was at the party that I asked my wife to come to the first day we talked. In over 13 years, ive seen this cousin a total of 8 times with only 3 of those times involving any amount of conversation. I love how the "relationship" turns when things are revealed. My wife revealed her affair to me. I sent an email to her cousin just to talk about my wife's depression after the fact her cousin went out of her way to say she didnt know she was having an affair and that it happened before they supposedly reconnected. (all lies).
Good luck with your meeting with the in-laws. I suppose it wont be very different from what you have experienced so far but I will pray for you.
Married 10 Together 13 ILYB 1/4/2010 Separated: 1/4/2010 Moved back in 1/28/2010 Reconciled 3/14/2010