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.
Through a dream about Cesare and their father, Giulio finds out he was never meant to be an innkeeper - or was he? Meanwhile, Eva is sad about Marco's departure, blaming her parents for his lover's decision.
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.
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?
Uncle Augusto comes back from the US and is welcomed gloriously by the whole family but Cesare, who seems to know something more about his brother's incredible story.
Marco and Rachele share a passionate kiss, but at the same time Eva gets enthralled by her step-brother's poetic leanings: the two of them write the song "Un mare di guai" together (even though he has Rachele in mind).