Twin brothers Kyle and Peter Reynolds find out that their mother, Helen, has been lying to them for years about their supposedly dead father. After discovering that their father is actually alive but not knowing who he is, Helen reveals that she had multiple relationships around the time they were conceived. Determined to find their biological father, the brothers set out on a cross-country road trip. As they embark on their quest, they encounter various potential candidates, including Terry Bradshaw, an ex-football star, and Roland Hunt, a shady veterinarian. Each man provides a different perspective on their mother and leaves the brothers questioning more about their identities.

Throughout their journey, Kyle and Peter experience numerous comical and poignant moments that test their brotherly bond. They meet diverse characters and face unexpected challenges, leading to personal growth and revelations about family and identity. The trip gradually veers into deeper emotional territory, as the brothers confront long-held grievances and truths about themselves. Ultimately, the search for their father brings them closer together and reshapes their understanding of what it means to be a family.