“When Ettinger and Johnstone began their film odyssey in 1989, neither dreamed their home-movie homage to their nannies, Martha Kneifel and Ethel Edwards, would blossom into a feature-length documentary that would set the 1994 Sundance Film Festival abuzz, win the audience award for best documentary at the October Hamptons International Film Festival, or be screened at the Museum of Modern Art’s contributors’ dinner next month.”