In a comedy that mixes the absurd with pure fun, two middle-aged men who still live with their parents find their lives turned upside down when their parents decide to get married. Dale, a music enthusiast, and Brennan, an aspiring actor, not only share the same house but also behave like two big kids who have never grown up. Suddenly, they have to confront the reality of being brothers, which triggers a series of hilarious conflicts and awkward situations.
Their cohabitation is marked by constant fights for their parents' attention and control over the house, as well as absurd rivalries that soon escalate to epic proportions. In their attempt to coexist, they discover an unlikely bond through the chaos they create in their daily lives, all while trying to find their place in a world that seems to have left them behind.
Things become even more complicated when they become embroiled in a crazy plan to save one of their father's business when things don't go as expected. The film is filled with iconic moments and dialogue that have become fan favorites, offering a fun and carefree look at family, friendship, and what it really means to grow up—or not grow up at all. In the end, what unfolds is a story about acceptance, where brotherly love emerges amid the chaos.