Both twins finish their school year on shaky academic ground - and twin Fs in math mean they'll both be spending time in summer school.

The Roloff family kicks off their over-ambitious road trip in an oversized RV. They've barely left their driveway when the trouble begins.

On the second leg of the Roloffs' RV journey, Amy and the kids question Matt's trip planning wisdom during a scorching trek through the 128-degree heat of Death Valley.

On the third leg of their RV odyssey, the differences between the Roloff boys and girls are in stark relief, as Amy and Molly spend a peaceful day in Sedona, Arizona - while Matt and his rowdy sons get their kicks along a stretch of old Route 66.

The conclusion to the sprawling Roloff road trip finds the family retracing their roots in California.

It's planting season, and farmer Matt leads the charge to get this year's pumpkin and corn crops in the ground - while Amy, Molly and Grandma Peg plant a family vegetable garden.

A few months after major leg surgery, Zach feels recovered enough to compete in the Dwarf Athletic Association of America Games.

After his long recovery from leg surgery, Zach is back in action and ready to face his soccer rivals.

For the first time in his life, Matt customizes a car (his red VW Bug) to fit him perfectly.

Jeremy, Zach and their pals push to finish building a "Swamp Fort" in the woods on the farm. Torn between Kirsten and his buddies, Jeremy does his best to finish the fort and throw a birthday party for Kirsten.

Zach invites three of his dwarf buddies to Roloff Farms for a weekend of paintball, horseplay and sports.

The LP weekend continues as Zach and his three dwarf buddies wage an all-out paintball war with Jeremy and his average height friends.

Matt is set to give a motivational speech in Paducah, Kentucky, a town steeped in Civil War history, so he decides to bring history buffs Zach and Molly along.

The Roloffs scramble to get their passports in time for their family vacation to the Bahamas, which kicks off with a sailing excursion.

With the Roloffs' Bahamas trip underway, Jeremy discovers he has a knack for sailing.

As their Abacos vacation draws to a close, the Roloffs really connect with Bahamian culture.

Matt goes to the doctor for the first time in years and discovers that his health is in serious jeopardy.

After his doctors recommend swimming as a good way to improve his failing health, Matt decides to fulfill a longtime Roloff wish to build a family pool.

Matt promises that the Roloff's new swimming pool will be completed in time for Molly's upcoming birthday party. With much of the project still unfinished, Jacob suffers another head injury, sending him back to the hospital.

The twins take the tests for their drivers licenses. Jeremy approaches his test with total confidence, but Zach is typically less certain. With both of her sons becoming drivers, Amy must come to terms with Zach & Jeremy's increasing independence.

It's a tense time for the Roloff family as Matt goes to court to learn the date of his upcoming DUI trial. Matt works with Amy to prepare his defense, but a meeting with his trial attorney reminds Matt that going to trial is a roll of the dice.

Matt's DUI trial begins and the prosecution presents its case. When the arresting officer testifies against him, Matt grows increasingly concerned about his chances with the jury. Tension mounts as Matt prepares to take the stand.

With wife Amy in the courtroom for support, it's Matt Roloff's turn on the stand in his DUI trial. Matt's lawyer lays out the defense, and the prosecution's cross-examination is intense. Matt and Amy have high hopes for a not guilty verdict.

Matt arranges a surprise dinner for Amy to mark their 20th wedding anniversary. Meanwhile, Jeremy & Kirsten celebrate their first year together - and Zach is in the early stages of his first romantic relationship with an average height girl, Danni.

Matt and his artist buddy Sven plan to build a sawmill with a working waterwheel. But when Matt leaves Sven in charge of preparing the farm's attractions for a corporate party, Sven has his own ideas about what's important, and tensions rise.