Nic and Jules are married and share a cozy suburban Southern California home with their teenage children, Joni and Laser.  Nic and Jules - or, when referred to jointly by Joni, "Moms" - gave birth to and raised their children, and built a family life for the four of them.  As Joni prepares to leave for college, Laser presses her to help him find their biological father; the two teenagers were conceived by artificial insemination. 

 

Against her better judgment, Joni honors her brother's request and manages to make contact with "bio-dad" Paul, an easygoing restaurateur.  The kids find themselves drawn to the confirmed bachelor's footloose style - especially in contrast to Nic, a principled doctor who has long established their house rules.

 

Jules, who has been looking to start a new career in landscaping, also strikes up a rapport with Paul.  As Paul comes into the lives of the forthright four, an unexpected new chapter begins for them as family ties are defined, re-defined, and then re-re-defined.