I was just "told" by my future sister in law that I have to invite my future mother in law, future grandmother in law and my FI's aunts to my Bachlorette party. My understanding was that traditionally, a Bparty is only for bridesmaids and a few close friends/*younger*family members. I know I can invite whoever I want, but my SIL is determined that they will be highly offended if they aren't invited. What's the proper protocol? I think she's out of line and having them there would just be awkward.