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Director Michael Apted has allowed moviegoers to watch children grow up into adulthood, in seven-year increments, in the acclaimed "Up" series.

In "American Promise," debuting at the 2013 Sundance Film Festival, filmmakers Joe Brewster and Michele Stephenson do something similar — encapsulating 13 years in the lives of two children, from kindergarten through 12th grade, in a single movie.

Brewster and Stephenson follow their own son, Idris, enrolled at age 5 in The Dalton School, an elite prep school on Manhattan's Upper East Side. They also follow Idris' best friend Seun, as they chronicle the lives of both boys — and their families — all the way through to high-school graduation.

"American Promise" debuts in the U.S. documentary competition of the 2013 Sundance Film Festival.