The kids rope Trent and Amber into viral video challenges.

A cooking competition inspires Alex to improve his culinary skills.

Trent and Amber surprise Emma and Alex with a go kart.

Liz's best little people friends have questions for Liz's boyfriend.

The Johnstons spend time with Jonah's girlfriend and her family.

Alex and Emma are excited to finally attend high school classes in person.

The Johnstons are inspired to build a pavilion in their backyard.

The family competes in their annual Turkey Bowl at Thanksgiving.

Jonah is the first Johnston to turn 21, and it's Christmas time.

Kim and Barry Plath face a tough decision for 16-year-old daughter Moriah.

The sheltered life of the Plath children is coming apart at the seams.

Moriah returns from San Francisco, and plans for a new band are discussed.

Major changes have caused a rift in the Plath family.

Lydia talks about her secret crush, and Moriah goes on her first date ever.

Ethan is left speechless after Olivia gets a body piercing.

Ethan and Olivia realize they need to move farther away from Kim and Barry.