In Rome, Giulio and Lucia meet again after 20 years. Being their old love very much alive, they decide to get married. The union between their two families under the same roof will bring unexpected (and amusing) consequences.
Sergio, Lucia's ex-husband, comes to Rome to say hello to her (soon to be married to Giulio) and their two daughters, but he has a much slier plan in mind: bringing the three of them back to Milan with him.
Giulio promises to have a magnificent wedding, but his plans clash with the family's limited budget. Meanwhile, the kids get to know each other better - or worse.
Giulio and Lucia finally get married. Unfortunately, Giulio messes things up when he brings her wife to the place where he mistakenly believes they first made love together. Righting this wrong will not be easy feat.
Inspired by the warm relationship Lucia has with Eva and Alice, Giulio tries a course change in order to soften his traditionally "physical" approach with his three sons - but at what cost?
Giulio struggles to find intimacy with an increasingly busy Lucia, while Walter pretends to be a Neruda enthusiast in order to win Eva over - something Marco does not seem to appreciate.
Giulio and Lucia have a misunderstanding about a gift from him, Cesare thinks he may be homosexual and Marco starts to realize that music is his life's dream.
Giulio's strong jealousy towards Lucia seems to be partially motivated, when she hides from him the advances made by her suitor, Andrea. Meanwhile, Marco's disenchantment about his place in the music world finds a tough cookie in Eva.
Troublemaking Rudi forges an aptitude test and manages to pass for a genius, Cesare brushes up his French in order to keep the bottiglieria's name in a prestigious tourist guide, while Gabriella steals family money - but for a good cause.
Sergio is honored with the Order of Merit for Labor and invites the whole Cesaroni family at the ceremony; Marco realizes he is falling in love with Eva.
Mimmo is tasked by his teacher with writing an essay about his late mother. The assignment turns into a chance for the Cesaroni boys to finally cope with their mother's absence.