What difficulties are Simon and Blair facing in their marriage in the novel, The Wedding?

Allegra's parents, Simon and Blaire, are going through a few problems while she is planning her wedding. Although still beautiful, Blaire feels that her age makes her less attractive to her husband. Furthermore, Simon's affair still stings her and causes her self-confidence to deteriorate. Planning Allegra's wedding and dealing with the pregnancy of seventeenyear-old Samantha create additional stress.

Despite all the complications, the wedding helps to bring Simon and Blaire closer together by helping them to rediscover their own commitment to each other.