A couple, Nic and Jules (Annette Benning and Julianne Moore), live with their teenage children, Joni and Laser (Mia Wasikowska and Josh Hutcherson), in a cozy craftsman bungalow in Los Angeles. As Joni prepares for college, her younger brother pesters her for a big favor—help him find their biological father. Against her better judgment, she makes a call to the sperm bank; the bank, in turn, calls Paul (Mark Ruffalo) and asks him if he’s willing to meet his daughter. He agrees, and a complicated new chapter begins for the family.