The Duncan family plans to go to Amy's parents' new condo in Palm Springs, California for Christmas. However, they are separated en route when Teddy (Bridgit Mendler) makes a snap decision to give up her airline seat for a free ticket to prove to her parents she can go to Florida for her spring break with her best friend Ivy (Raven Goodwin). Unwilling to let her daughter travel alone, Amy (Leigh-Allyn Baker) also disembarks the plane, only to discover that the next flight to Palm Springs departs after Christmas. Meanwhile, the rest of the family arrives in Palm Springs, but things aren't any easier as Bob (Eric Allan Kramer) tries to care for Charlie (Mia Talerico) under the watchful eye of Amy's mother Petunia (Debra Monk), who strongly dislikes Bob and blames him for Charlie's mischief and the other's kids mishaps; PJ (Jason Dolley) learns the pros and cons of his grandparents' pool after getting a sunburn; and Gabe (Bradley Steven Perry) quickly realizes the downfalls of teaching Grandpa Hank (Michael Kagan) how to play his favorite video game, Galaxy of Death, after Hank becomes addicted to it.