The Johnsons finish their final preparations to welcome a new addition to the family; Anna celebrates Halloween at her new home, and the siblings make freezer meals for Liz and Brice.

With Liz's c-section date just around the corner, the family does a trial run in case she goes into labor beforehand. The youngest Johnston turns 18, and Alex has an epic birthday party. Liz and Brice put finishing touches on the nursery.

The kids have strong reactions when learning how to change a dirty diaper; Trent and Jonah throw Brice a dad-chelor party; Liz moves back home, needing some extra support.

Liz and Brice head to Florida for a babymoon and discuss their fears about the upcoming birth. Anna opens up to a friend about the struggles LP women have in the dating world. Emma wants a pink palette as the family starts bathroom renovations.

Elizabeth and Brice reveal if their baby is average sized or a little person. Anna and Emma struggle to create the perfect diaper cake as the family hosts a baby shower for Liz. Trent plans a romantic and stress-free date with Amber.

The family hosts over 100 people at their house for Poppy's 90th birthday, where Liz and Brice share their exciting news; Liz and Brice go for an ultrasound to find out if the baby will be a little person or average sized.

With Emma and Alex starting senior year of high school, Trent and Amber prepare to enter into the empty nester phase of their lives; Anna becomes a homeowner and Jonah dives into a new passion; Liz navigates her complicated relationship with Brice.

Liz has a big announcement that shocks the entire family; the siblings react to Liz keeping such a big secret from them, while Trent and Amber process the news of the changing Johnston family dynamic.

The Johnstons head to Austin, Texas for the LPA conference; the family holds a workshop, Alex is reunited with Allie, and Trent and Amber compete in the talent show; back home, Liz and Brice need to share big news with their parents.

The Johnstons cool off with an ice water bucket challenge; Liz and Emma give Anna fashion advice for the upcoming LPA conference; the family practices their workshop and realize they have a lot of work to do, and quickly.

Alex confides in Jonah about his relationship struggles; Trent and Amber's next date night involves a game of truth or dare; then, Jonah feels the heat as he enters his first BBQ competition.

Trent and Amber take their first vacation ever without the kids; Anna uses her new cooking skills to make dinner for the family; Emma looks for a summer job at a local boutique; then, Jonah enlists his siblings to taste test his barbecue sauce.

Anna hosts a summer party at her new home, complete with an ice cream competition; Emma and Alex surprise Amber with a twist on a fancy Mother's Day meal; Trent and Amber show off their new salsa costumes and their unconventional moves.

The family visits a farm and meets dwarf cows; Alex and Emma attend prom; Trent and Amber relive their high school romance; when Ashley visits, the girls take her out on the town for brunch and try to get the scoop on her relationship with Jonah.

The family takes a trampoline exercise class; after several kitchen mishaps, Anna learns to cook; Emma opens up to Liz about struggling to make friends, while Alex hangs out with twins from his robotics team.

Trent celebrates his birthday with a competitive go-kart race; Liz deletes her relationship from social media; Alex gets an answer to his promposal; the older siblings get together to catch up, and Jonah finds a new challenge to his hobby.

Elizabeth makes a big decision about her relationship with Brice; Amber and Trent try out body painting; Anna buys a new home and starts the process of moving in; Jonah and Alex write love letters to their girlfriends.