My fiancee and I got engaged Memorial day weekend. Since then I asked 2 friends and my sister to be in the wedding. My sister said she wasn't sure because of business and child obligations she has. My sister just told me today she can't be in our May 2010 wedding, so now I have to ask another friend and am not sure how to ask her. Do I just tell her that my sister backed out and now I need somebody else? Kind of a weird position I feel like I'm in now asking my "backup" friend to be in the wedding. This friend I'm going to ask is a great friend, and I just don't want to offend her so just trying to figure out the wording for this. Any suggestions, please???