After a doctor's visit, Arthur learns he's under high stress due to Valentine's Day approaching. To de-stress, Arthur suggests his concerns to Camille and asks if they can take a break from the holiday which causes them to fight. He shows up at Lena and Martin's house, where they help by taking him in. Meanwhile, Maya and Camille express disapproval when Lena decides she wants to cook a platonic Valentine's Day dinner for Martin at home. Elsewhere, Mason organizes a Valentine's Day flash mob for his girlfriend.
A newly divorced couple embrace the unconventional as they co-parent their children by trading residences each week, alternating between one living in the main house and the other in the garage apartment as they also adjust to being single for the first time in years. This new arrangement will land Lena and Martin in some precarious situations, with Lena's doting sensibilities and Type-A personality clashing with Martin's laid-back temperament as they attempt to raise the kids separately but together. What will Lena and Martin do with their unfamiliar moments of freedom? And how will they manage their feelings when this freedom is met with the nostalgia for what they once shared as a couple and their mutual longing for their family to be whole again? With the help of friends Arthur and Camille, plus Lena's sister, Maya, this former couple will explore what it means to live apart... under the same roof.