"Cheaper by the Dozen 2" is a family comedy that follows the chaotic lives of the Baker family as they embark on a summer vacation. The story picks up with Tom and Kate Baker, played by Steve Martin and Bonnie Hunt, who are now navigating the challenges of raising their twelve children as they transition into adulthood. When the Bakers decide to take a trip to a lakeside resort, they unexpectedly cross paths with their old rivals, the Murtaughs, led by the competitive and overbearing Jimmy Murtaugh, portrayed by Eugene Levy.

As the two families engage in a series of hilarious competitions, the Bakers must confront their own family dynamics, including sibling rivalries and the struggles of growing up. Each child faces their own unique challenges, from romance to personal aspirations, all while trying to maintain the close-knit bond that defines their family. The film blends humor with heartfelt moments, showcasing the importance of family unity and the chaos that often accompanies it. Ultimately, "Cheaper by the Dozen 2" delivers a lighthearted message about love, acceptance, and the joys of family life, all wrapped up in a fun-filled adventure.