The cursed idol, in the shape of a monkey, is discovered by Alexander in the attic. It is revealed that the Garcia family has been cursed by this idol for decades, stemming from a bargain made by Alexander's great-grandfather with a trio of witches. This curse is believed to be the source of the family's misfortunes during their road trip.

The family's dynamic plays a crucial role in the story. Alexander's father, Frank, is dealing with financial issues and lies about his failing restaurant. His mother wants everyone to get along and reconnect with their heritage, but she often clashes with their angsty teenage daughter, Mia, who misses home. The grandparents, Gil and Lidia, constantly argue and struggle to be in the same room together, adding to the family's tension.

The family embarks on a dream Spring Break vacation to Mexico City. However, their plans quickly go awry due to the cursed idol. The trip to Mexico City serves as a backdrop for the family's adventures and misadventures as they navigate their personal issues and the supernatural challenges posed by the idol.

Alexander, played by Thom Nemer, is initially portrayed as someone who might be blamed for his family's bad luck. However, as the story progresses, it becomes clear that the cursed idol is the source of their troubles. Alexander's character evolves as he learns about his family's past and helps them resolve the curse by returning the idol to its rightful home.

The family faces numerous challenges during their road trip. These include dealing with the supernatural effects of the cursed idol, navigating their personal conflicts, and managing the practical difficulties of traveling together in a smart RV. The family's financial issues and personal disagreements are exacerbated by the idol's influence, leading to a series of comedic and dramatic events.