In 1972, three years before Albert and David Maysles made their now-famous documentary about “Big Edie” and “Little Edie” Bouvier Beale (Jacqueline Kennedy Onassis’s aunt and cousin) and their rapidly decaying Long Island mansion, Lee Radziwill (Jackie’s sister) hired the Maysles brothers to visit the Beale homestead, where “they shot an hour of Big Edie and Little Edie squabbling with each other and the health officials threatening eviction.” That footage is now coming out in a documentary titled That Summer.