Annette Bening, Julianne Moore, Mark Ruffalo, Josh Hutcherson and Mia Wasikowska are set to star in “The Kids Are All Right.”Director Lisa Cholodenko (“High Art”) begins shooting today from the script she co-wrote with Stuart Blumberg. Pic revolves around a brother and sister (Hutcherson, Wasikowska) who set out to find their same-sex parents’ sperm donor, who totally upsets their family dynamic once he enters their lives. Bening and Moore play the parents, and Ruffalo plays the donor. Inferno Intl. is handing international sales on the film. Jeffrey Levy-Hinte of Antidote Films is producing with Plum Pictures’ Celine Rattray and Daniela Taplin-Lundberg, UGC PH’s Philippe Hellmann and Gilbert Films’ Gary Gilbert and Jordan Horowitz.