Hey all!
I have been engaged for about 3 months, and am new to the wedding scene. I have never even attended a wedding before. Here is my dilemma:
My fi's brother is also engaged, and his bride, who I hardly knew, made me a bridesmaid. I was honored, because I knew they were trying to include me in their wedding, since my fi is obviously the best man. They have a small bridal party, 3 bm's and 2 gm. 
Fast forward to my engagement, and now I feel that I have to have FSIL in my wedding. I want a small bridal party, and already have 4 very close friends who I can't imagine my wedding without. Also, if I add FSIL, I feel obligated to also add my own sister. My sister and I have never had a strong relationship, and she has told me that she is totally fine not being a part of the wedding party, but still be included. I feel obligated to have both because sometimes I feel that my family is jealous of my fi's, and if I only include one "sister", I know there will be problems.
I was just going to politely talk to the FSIL to ask if she wanted to be a reader during the ceremony (she is a wonderful public speaker), to keep her involved in a personal way. The Kicker is that apparently she was talking to my FMIL about being my bridesmaid, even though I haven't asked her yet! I think she assumes, since I will be hers. 
Should I just have 6, and deal with it (my fi is going to have 3 gm)? Or should I still try to politely talk to future sis? I really wanted a small wedding party with my closest friends. FSIL lives across the country, so wouldn't be involved in much of the planning anyway. I don't know what to do! I don't want to cause rifts in my new family, especially my fi's brother, who he is very close to! I just need some outside opinions.                
                