. . . "De Niro, 70, who has won Oscars for his lead role in ???Raging Bull??? and his supporting turn in ???The Godfather: Part II,??? attended the Sundance Film Festival in Park City, Utah, Sunday to premiere ???Remembering the artist Robert De Niro, Sr.,??? a HBO documentary about his father, who emerged alongside such contemporary artists as Jackson Pollock and Willem de Kooning.Robert Sr. grew up in" .