Mark RuffaloAfter a stellar turn in Martin Scorsese's 'Shutter Island,' one of his biggest box-office hits to date, Mark Ruffalo returns to the world of indie in 'The Kids are All Right,' a touching and often hilarious family comedy co-starring Annette Bening and Julianne Moore.

In the movie, Ruffalo plays Paul, a fortysomething bachelor who anonymously donated sperm back in the day. It turns out his sperm was used twice by a lesbian couple (Bening and Moore), and on the heels of college, their 18-year-old daughter (Mia Wasikowska), with the help of her brother (Josh Hutcherson), secretly decide to contact Paul to see what he's really like. As Paul develops relationships with the family, including one with Moore's character, they each must determine how much they really want him in their lives.

In preparation for the movie (in theaters Friday), Ruffalo spoke to Moviefone about its universal themes, filming sex scenes with Julianne Moore and whether 'Margaret,' Kenneth Lonergan's much-delayed and long-awaited follow-up to 'You Can Count on Me,' will ever get a release date.