chunk: Nic (Annette Bening) and Jules (Julianne Moore) are a married lesbian couple living in the Los Angeles area. Nic is an obstetrician, and Jules is a housewife who is starting up a landscape design business. Each has given birth to a child using the same sperm donor.
  The younger child Laser (Josh Hutcherson) wants to find his sperm donor father but has to be 18 to do so. He implores his 18-year-old sister, Joni (Mia Wasikowska), to contact the sperm bank which identifies Paul (Mark Ruffalo) as the donor. The three meet. Joni is impressed by his bohemian lifestyle, and Paul becomes enthusiastic about being in their lives. Joni swears her brother to secrecy as she does not want to upset their mothers. However, Jules and Nic find out and invite Paul over to dinner. When Jules reveals she has a landscape business, Paul asks her to transform his back garden. Jules agrees, although Nic does not like the idea.