WHAT DO I DO?LONG

My FMIL, my mother and I were talking weddnig stuff yesterday...

FMIL asked about my side of the bridal party and I told her. She said, WHY isnt D$%^& in Bridal Party???

I told her that my FH and I discussed it and that since it is only FH's brothers girlfriend and not really my friend it wouldnt be necessary.

She said, ye, but they have been dating 5 years

This is true they have been however they are always on the brink of breaking up, she is nto my favorite person, she is cheap, she is okay...but not really my friend and even Fh is not overly fond of her.

FMIL and my mom began talking about it my mom tried to help me out...but she still thought i wasnt doing the right thing and that she was going to be upset

FH and I discussed it when we got home and he said that I absolutely do not have to have brothers girlfriend...BUT the last thing i want to do is cause drama!

Should i have brothers girlfriend to avoid problems or stick my guns and not change my plans?

please give advice