<P> Mild - mannered radio executive Brad Whitaker struggles to be a good stepfather to his wife Sara's two children, Megan and Dylan, and is seemingly sterile after an accident to his testicles some years ago . The children begin to grow closer to Brad, with Dylan confiding in him that he is being picked on at school and Megan asking him to take her to a father / daughter dance at her school . One night, the kids' biological father, Sara's ex-husband Dusty Mayron, calls and discovers Sara's marriage with Brad . He suddenly announces he will be visiting the next day . Sara hesitates to let her ex-husband into their home, but Brad convinces her that it is important for the kids that their father and stepfather establish a respectful relationship . </P> <P> When Dusty arrives, Brad is immediately intimidated by his tough and muscular appearance and his charm with Megan and Dylan . Dusty repeatedly talks Brad into letting him stay, despite Sara warning about Dusty's true nature . Brad soon wises up when it becomes clear that Dusty intends to drive Brad out of his kids' lives and reconcile with Sara . After Dusty shows Brad up again and again - getting the kids a dog, finishing a treehouse that Brad wanted to build with Dylan, making Brad appear to be racist - Dusty tries to drive a wedge between Brad and Sara by taking them to a fertility doctor, hoping that Brad's inability to give Sara a baby will send her into Dusty's arms . Still, the two men appear to reach an understanding after working together to teach Dylan how to defend himself . Additionally, Brad and Sara are overjoyed to learn that Brad's sperm count has increased significantly (implied to be a result of Dusty "invading his territory"), giving them hope of having a child together . </P> <P> However, Brad is stunned when Dusty reveals that he still intends to drive Brad out of the family . Desperate, Brad spends tens of thousands of dollars on early Christmas gifts, including a pony and $18,000 basketball tickets . At the game, Dusty once again shows Brad up by revealing himself to be friends with the coach of Dylan's favorite team, and an enraged Brad begins drinking heavily . During half - time, Brad is chosen to try to shoot a basketball to win a prize . Drunk, Brad goes on a rant about Dusty before accidentally pelting a cheerleader and a disabled child in a wheelchair in the face with basketballs . Humiliated by her husband's antics, Sara kicks Brad out of the house; however, when Dusty tries to comfort Sara, she rejects him, and forces him to step up as a dad to help his kids with their busy schedules . </P> <P> Four days later, Brad is living in his office at work, depressed . Dusty, meanwhile, is overwhelmed by the responsibilities of being a full - time father . When Dusty decides to call it quits and leave on the day of Megan's father - daughter dance, his friend Griff goes to Brad and convinces him to fight for his family . Brad catches Dusty at a bar and tries to get him to come back . Dusty admits that he cannot handle the hard parts about being a father, and admires Brad for putting up with all the things that he has to go through . Brad says that all of the terrible parts about being a dad are worth it, because in the end he is doing it for his kids . This convinces Dusty to go to the dance, and he and Brad arrive together . There, they discover that the classmate who was picking on Dylan at school is a girl, and almost get into a fight with her father when Dylan physically retaliates . However, Dusty finally decides to follow Brad's lead on being a father, and instead quells the fight by starting a dance - off . Brad and Sara reconcile, and Dusty decides to stay and be a good "co-dad" to his kids . </P>

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