Joni (Mia Wasikowska) and Laser (Josh Hutcherson), the children of same-sex parents Nic (Annette Bening) and Jules (Julianne Moore), become curious about the identity of their sperm-donor dad (Mark Ruffalo) and set out to make him part of their family unit, often with hilarious results. But his arrival complicates the household dynamics, and nobody is sure how he fits in — if at all — in this Oscar-nominated, Golden Globe-winning comedy.

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