With the due date near, Jinger and Jeremy get ready to meet baby Vuolo; John whisks Abbie away on a surprise trip to ask for her hand in marriage; Jinger's labor takes an unexpected turn.

The hills are alive for Josiah and Lauren as they go on their Austrian honeymoon; while there, they re-enact scenes from "The Sound of Music" and visit with a local family; Jinger worries she won't have the smooth labor she was hoping for.

Jessa, Lauren, Kendra and Jana pair off with some of the little kids and go head to head to create a groom's cake for John and Abbie's wedding; Josiah and Lauren's worlds are shaken up when they reveal some tragic news.

In Laredo, Jeremy is on daddy duty as Jinger runs errands. Meanwhile, John & Abbie's wedding is just around the corner! John and the boys partake in a thrilling competition while Abbie tries on wedding dresses. Will Abbie be able to find "the one?"

John David and Abbie fly to the Philippines for a mission trip weeks before their wedding; Jinger and Jeremy travel up north so Felicity can meet her great-grandparents; while there, they get a surprise from some very unexpected guests.

John and Abbie's wedding is finally here and everyone is in full wedding-mode as they get ready for the big day; at the altar, the bride and groom share their first kiss in an unexpected way; a family member has a very special announcement.