The Johnston family is stepping into uncharted territory as the kids grow into adulthood and life brings new challenges and joys for everyone. Liz and Brice are soaking up every moment of parenthood as their baby daughter, Leighton hits millstone after milestone from her first swimming lesson to her first day of daycare, her first birthday and more. Through it all, Liz and Brice are still figuring out the ins and outs of parenting as they chart their own course together as a family unit, including potentially purchasing property and talk of getting engaged.

The Johnstons are back! Liz and Brice's baby girl, Leighton, has arrived home safely from the hospital, and the lively Johnston family quickly realizes that life gets even more interesting with a newborn in the mix. As Liz and Brice navigate their new roles as parents, Trent and Amber embrace their new titles as Lolly and Boppa, though not without a few growing pains.  Amidst the joy, Trent faces mysterious health issues, adding a layer of concern to the family's dynamic. This season also brings plenty of celebrations: Trent and Amber mark their 25th wedding anniversary, Anna and Amber graduate from college, and Emma and Alex graduate from high school. However, when Anna decides to skip Alex and Emma's ceremony, it causes an unexpected rift in the usually jovial Johnston family.