[SweetCuteness]

This is all horrible! Your BIL's girlfriend isn't even technically a part of the family and you've been there for years. I'm sorry you're going through this. I would feel exactly the same way. When the grandparents are older, and all the grandkids are grown, they'll regret what they've done now... especially when they feel neglected and don't ever come around the grandparents. Maybe then the grandparents will understand how it feels.