Lucy and Curtis are Up a Tree - S0.E2

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.