I'm not going to react to a weird situation between my family and gf
Why are you choosing to be unreactive?
I don't know what's going on, I'm weirded out
You should find out what is happening with them. You should want your girlfriend and family to get along with each other.
What if my friends get mad at me?
This situation has nothing to do with your friends. You need to handle things with people closer to you first.