The eldest of the family, Sara, comes of age and brings chaos to the family by announcing her intention to marry Ocho. Javier and Marisa try to avoid it at all costs. At the same time Dani has an existential crisis, Paulita feels jealous of Cris, Carlota announces that she has found a boyfriend from a high society family and Rocio has finally managed to be cast in her first film.

In 'Padre no hay mas que uno 3', the children accidentally break a nativity scene figure, leading to a series of hilarious events during their Christmas celebration. Meanwhile, Sara ends her relationship with her boyfriend, and Javier's father-in-law arrives following his separation from Rocío. As the chaos unfolds, Rocío is assigned the role of a shepherdess in the family's holiday festivities.

When a workaholic father is left in charge of his kids, chaos ensues as he navigates the world of parenting and tries to keep his family together. With the help of technology and unconventional methods, he learns valuable lessons about family and relationships.

In 'Father There Is Only One 2', Javier is faced with new challenges as his wife goes on a trip and leaves him in charge of their five children. Chaos ensues as Javier tries to balance his work as a book editor with his responsibilities as a father, dealing with issues like his daughter's first communion, a flamenco class, a camping trip, and a surprise pregnancy. With the help of his nerdy brother and a housemaid, Javier navigates the ups and downs of parenting, learning valuable lessons along the way.