Years after unexpectedly becoming a father figure, Sonny Koufax (played by Adam Sandler) has grown into a responsible dad and successful business owner. He’s now raising Julian, who’s entering his awkward teenage years and beginning to challenge authority. Sonny tries to balance being a cool dad with enforcing boundaries, but old habits die hard, and his laid-back parenting style is starting to backfire.
When Julian’s rebellious behavior lands him in trouble at school, Sonny is forced to confront the gaps in his parenting. Things spiral further when Sonny reconnects with his estranged father, who offers tough love advice — rekindling old tensions and forcing Sonny to re-examine his childhood. Meanwhile, Julian secretly applies to boarding schools, hoping to escape the chaos and find independence.
Amid the emotional mess, Sonny’s girlfriend proposes they adopt a child together. With a possible new addition to the family, Sonny has to grow up all over again — this time as a partner and father of two. Chaos ensues as he juggles teenage angst, commitment fears, and the return of old friends with bad ideas.
In the end, Sonny learns that real maturity means letting go of control and allowing others to make mistakes. Through heartfelt missteps, awkward humor, and classic Sandler charm, Big Daddy 2 delivers a touching message about modern family, second chances, and the lifelong challenge of becoming the parent you never had.