I am making my FI's sister a bridesmaid because he wants her as one. Both of his siblings are in our wedding, not sure if they are even going to come (they have both made comments about not being able to afford it). My full sister I did not ask because I know she can't afford to come the DW, so I did not want her to feel obligated. I have my 1/2 sister as a my maid of honor, my cousin, a good friend and his sister. She asked me to stand in her wedding, but I just feel she did it because she felt obligated to do so, now I am having her stand because FI thinks it is the right thing to do. I am buying my attendants attire and was hoping to buy off the rack to save money, I feel strange about asking her size as she is plus size and we are not close so I don't want to offend her. So finding my attendants attire has been challenging. I know she has no intentions of hanging out with me all day while I watch her try on dresses.