I cannot remember where, but I read or heard somewhere that a Lucy episode be it I Love Lucy, The Lucy Show, Here's Lucy and/or Life with Lucy started with a simple premise and built from there. Lucy and Curtis Are Up a Tree, the tenth and second unaired Life with Lucy episode, takes that idea to a whole new level by literally telling you about the entire plot in the title. Lucy and Curtis Are Up a Tree is also bad, just bad, and would have been another reason to dump this misguided debacle.
Margo McGibbon (Ann Dusenberry) is very concerned that her mother Lucy Barker (Lucille Ball) and father-in-law Curtis (Gale Gordon) are spoiling the kids. Margo's husband Ted (Larry Anderson) is more blase about things, and their disagreement turns into a fight. Lucy overhears the fight and is alarmed.
She goes to Curtis, who is busy building their grandson Kevin (Philip J. Amelio, II) a treehouse. Realizing that they have indeed been spoiling the children, they agree the best solution is to move out. Which one should move out, though, is a source of contention. Kevin overhears their conversation via the walkie-talkie Curtis got him. Managing Herculean strength, Kevin moves the latter away from the treehouse to force them to negotiate.
Lucy and Curtis agree to cut back on their gifts and that neither will leave, which brightens their day. That is a counter to the rainstorm that traps them there. They are all wet but there's hope. The rest of the family has returned, rescued them, agreed to not seeing them go and everyone starts "singing in the rain".
Next (Unaired) Episode: Lucy's Green Thumb