The documentary film, "American Promise" spans 13 years as Joe Brewster and Michèle Stephenson, middleclass African-American parents in Brooklyn, N.Y., turn their cameras on their son, Idris, and his best friend. Both boys attended Dalton, one of the most prestigious private schools in NYC, and the country. The film chronicles the boys' divergent paths from kindergarten through high school graduation, presenting complicated truths about race, class and opportunity. I spoke with Michèle Stephenson about the story.