My sister finally got to set her date for her wedding, and she and her fiancée told his sister. She is pregnant and her due date falls 4 weeks after the date. She is pretty self-centered and told my sister to change her date to a few weeks earlier.
My sister is very upset; it took her awhile to find a date, and now she has to ask our younger sister not to go on her mission trip.
What do you think she should do? Would it be reasonable to keep the date that works for everyone but the sister-in-law?