Despite their aristocratic background - and the fact that they were aunt and cousin to Jackie Onassis - Edith Bouvier Beale and daughter Edie lived in anonymity in a decaying mansion on New York's Long Island. But, in 1976, when Albert and David Maysies's film appeared in US cinemas, it gave the pair the fame they longed for - and the public a glimpse into the interdependency and private language of their eccentric lives.