The 1999 massacre of school children in Columbine H.S., Colo., will be the topic of a feature documentary and panel discussion on NET-TV this Sunday, Sept. 15, beginning at 8 p.m. The film, “13 Families,” will examine the shooting at the school, which killed 12 students and one teacher. Following will be an in-studio discussion with, above, from right, Father James Cunningham, pastor of Holy Name parish, Park Slope; Columbine parent Darryl Scott; Liz Faublas, NET’s Currents’ anchor; and Ken Wodzanowski, Bensonhurst youth coordinator.