Ted and Margo feel that Curtis and Lucy are spoiling their grandchildren too much. It doesn't help matters when Curtis begins building Kevin a treehouse, which begins a quarrel between the couple. While working on the treehouse, Lucy and Curtis decide to relieve Ted and Margo's burden by arguing over which will move out -- and Kevin walks off with the ladder, trapping them in the tree.

When Lucy makes health shakes for the family, they show their appreciation by pouring them each into an ailing plant. When the plant shoots up overnight, Curtis thinks he has a million dollar plant growing supplement -- but Lucy can't remember what she put in it.

Curtis sells Lucy his share of the store so he can retire. Lucy goes all out for a solo-ownership celebration and winds up nearly broke. So she interviews candidates to take over Curtis' position, finally settling on Curtis -- who found retirement less satisfying than he had expected.

Lucy, jealous that everyone else in the family has a trophy to boast, is urged by Becky to join a talent show. After trying her hand at singing, dancing, telling jokes, and doing magic, Lucy finally settles on reciting a song. When she fails to win the trophy, the grandkids get her one of her own that reads "World's Greatest Grandma."