Not only is the Bates brood growing, but they're all maturing and reaching new milestones! As the family comes together to celebrate Katie's turning 16, it's time for her to finally join in on the Bates girls' tradition of receiving a purity ring. With the entire family together, Kelly Jo and Gil get to share the good news that they've secured a new location for their congregation, Mama Jane gets to meet her new great-grandbabies for the first time, and Papa Bill, Gil and Lawson hit the links to see which Bates is the best golfer.

It's a milestone birthday for the Bates matriarch and the family wants to make sure it's a birthday Kelly Jo will never forget! After months of planning, the time has finally come to honor Kelly Jo's 50th! To make sure the surprise stays in tact, Gil takes Kelly Jo on a romantic getaway to Chattanooga, TN, or so she thinks. Meanwhile, the Bates kids are scrambling behind the scenes to pull off this major clandestine event and surprise Kelly Jo with a Bates style celebration! Can they pull it off?