Annie and Ruthie spend the day together to unwind, while Lucy's world becomes complicated by both professional and personal news, and Eric unintentionally shakes up things between Rose and Simon.

The Camdens receive official invitations to Simon and Rose's wedding, and to their dismay, they learn that the date conflicts with Matt and Sarah's graduation from medical school. As this news creates a tailspin with the family, Rose stubbornly refuses to change the wedding date. Eric and Kevin think they have a solution to the problem, but when Annie disapproves of their methods, she looks for help from an entirely different source. Meanwhile, Ruthie wants to enroll in a summer program that takes place in Scotland.

As Rose gets ready to make a huge announcement, Simon breaks down as he realizes that he may have trapped himself in a marriage that he does not want. Meanwhile, Eric and Annie reminisce about their children and their younger days as they prepare for the rehearsal dinner and meet Rose's unconventional parents.

Simon and Rose prepare for their wedding day, despite speculation that it is not the right decision. Annie and Eric go through countless scenarios in their minds as they reflect on how the wedding will actually turn out.Meanwhile, Rose's former boyfriend shows up unexpectedly. Ruthie considers studying in Scotland over the summer. Kevin, Lucy, Matt, and Sarah all have life-changing news, if only they can find the perfect time to share it with the family...and the surprises don't stop there!