We decided not to announce our engagement for awhile because we want to finish our degrees first. In the meantime, his sister (older by one year) got engaged and is planning to be married before we intend to announce our big plans. She is planning my dream wedding- same month, same color scheme, etc and asked both of us to be in it. I don't want to hurt anyone's feelings, but I also don't want to copy her/change my plans. Any suggestions?