When I initially got engaged, I asked all of my sisters to be my BMs (I have four total - half, bio, and steps). All of them expressed complete interest in being in the wedding. Since Ive picked out the dress in April and provided all of my sisters the information for the dress (where to get it, what information to provide Davids so they got the right color, etc) all but one BM has bought her dress. Ive already had one person who had to bow out, but I was completely understandable since she is paying for her sons tuition and they live in another state (one of my MOH was my cousin). But now its three months away and one of my sisters hasnt bought her dress yet. To make matters worse, her daugher (my neice) is one of my flower girls and they havent gotten her dress either. Ive spoken with my brother in law and he said that they wouldnt know for certain if they would even be able to come until the end of September. At that point it would put me in a bind in getting someone to step in. What should I do at this point? I love my sister and very dearly want her to be part of my wedding, but should I should I, at this point, ask someone else? Or wait till September when she knows if they will be able to come? My wedding is the end of November.