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.