It’s been two years since Julien, Marie, Jacques, and Sylvie began living under the same roof. With this milestone, Jacques decides to make a life-changing decision—one that is not well-received by his family.

Julien decides to work with Jacques in a bid to get him to stay as Marie makes a confession that may impact her studies. A strange new neighbor makes an unsettling first impression.

Swayed by recent events at the apartment, Sylvie debates whether she should move home. Meanwhile, Julien struggles to wrap his head around new “neighbor” Julie’s confession as the pair disagree about whether to tell Sylvie the truth.

Julien and Marie spend an evening with Lea and Sam, who have become an item, but the mood sours when talk turns to babies. Drunk and left to their own devices, Julien and Lea hatch a scheme to give them both what they want.

Tensions run high as Julien and Marie come to an impasse about their relationship. Wanting to keep their decision under-wraps, the pair try to hide it from the rest of the family, but find that’s easier said than done.

Julien makes a split decision that leaves each member of the family to react in their own way: Sylvie with panic, Jacques with indifference, and Marie struggling to keep their breakup a secret.

Julien has fled to Lyon to stay with Julie at their father Michael’s house while he’s away. But despite their attempt to make up for lost time, they find these moments are not without their costs.

Together, Julie and Julien return to Chaville just as Jacques is preparing to make his big departure. Julien tries to make things up with his son, but an unplanned arrival threatens to change everything.

As Jacques finally leaves the nest, a new baby arrives. Now that their son has gone, Julien and Marie face the question of what the future of their relationship looks like. A visit to Julie and her baby reunites Sylvie with an old flame.

A year has passed and Marie has finally completed her thesis. The group, reunited after a long separation, uses the occasion to catch up and celebrate, as Julien prepares a big surprise for Marie.