Giulio Cesaroni and Lucia Cudicini, he a widower, she separated, meet again after twenty years in Rome. They realize they still love each other and decide to get married, so Lucia's daughters, Eva and Alice, arrive from Milan and move in with the Cesaronis. Getting to know Marco, Rudi and Mimmo, Giulio's sons, is not easy and things are also complicated by uncle Cesare, Giulio's brother, and his jealousy.

Sergio wants Lucia to get back together with him, but after her ex refuses, the ruthless manager goes to Giulio's liquor store and threatens to take away his future wife, daughters and job. Giulio acts on impulse and doesn't hesitate to punch him, so Sergio, with the complicity of a doctor friend, makes the Cesaronis believe he is dying.

Giulio, Cesare and Ezio are about to leave for the traditional fishing trip when Sergio, seriously ill, shows up again. The three, suspicious of the sudden arrival of Lucia's ex, kidnap him and take him with them to Abruzzo. Upon returning to Rome, his illness revealed, the man says goodbye to his family and leaves for treatment in the United States, accompanied by Lucia, encouraged by Giulio.

Little Mimmo is in love with his classmate Sara, who plays the princess in the school play. The child, in order to be close to her, accepts the part of the maid of honor and asks Lucia for help in getting ready. Giulio, noticing the preparations for the play, misunderstands Mimmo's interest in the female universe and, believing him to be gay, tries to involve him and convert him to male activities.