Question: Who is the sibling of the director of A Vanished World?

full_context: Document 1: Bartolomeo Pagano: Before his cinema career, Pagano was a stevedore who worked at the port of Genoa. There, he was discovered and selected to play the role of Maciste, a muscular slave, in the silent movie classic "Cabiria" in 1914. As the originator of this role, he went on to play the character for the next 14 years in a series of sequels. Pagano became an international star, and legally changed his name to Maciste. The actor retired from films in 1926 to marry and raise a family in his home town of Genoa. He died there, aged 68, and is buried on the family estate in Italy.
Document 2: A Vanished World: A Vanished World (German: Eine versunkene Welt) is a 1922 Austrian silent adventure film directed by Alexander Korda and starring Alberto Capozzi, Victor Varconi, María Corda and Olga Lewinsky. It was based on the novel "Serpoletto" by Lajos Bíró. A Habsburg archduke enlists as an ordinary seamen. The film won the Gold Medal for Best Dramatic Film at the Milan International Cinema Concourse.
Document 3: And Love Has Vanished: And Love Has Vanished () is a 1961 Yugoslavian drama film directed by Aleksandar Petrović. It was entered into the 1962 Cannes Film Festival.
Document 4: Men of America: Men of America is a 1932 American Pre-Code Western film directed by Ralph Ince and written by Samuel Ornitz and Jack Jungmeyer. The film stars William Boyd, Charles "Chic" Sale, Dorothy Wilson, Ralph Ince and Henry Armetta. The film was released on November 25, 1932, by RKO Pictures.
Document 5: Number 111 (1919 film): Number 111 (Hungarian: A 111-es) is a 1919 Hungarian silent thriller film directed by Alexander Korda and starring Gábor Rajnay, María Corda and Gyula Bartos. The film was based on a novel by Jenő Heltai. It was Korda's final Hungarian film before he went into exile in Austria during the White Terror. The film was remade in 1938.
Document 6: Men of Tomorrow: Men of Tomorrow is a 1932 British drama film, directed by Zoltan Korda and Leontine Sagan, produced by Alexander Korda and written by Anthony Gibbs and Arthur Wimperis. It stars Maurice Braddell, Joan Gardner and Emlyn Williams and features Robert Donat's movie debut.
Document 7: The Vanishing American: The Vanishing American (1925) is a silent film western produced by Famous Players-Lasky in the United States, and distributed through Paramount Pictures. The film was directed by George B. Seitz and starred Richard Dix and Lois Wilson, recently paired in several screen dramas by Paramount. The film is based on the 1925 novel, "The Vanishing American", by Zane Grey. It was remade as a 1955 film starring Scott Brady and Audrey Totter.
Document 8: The Dawn of a Tomorrow (1915 film): The Dawn of a Tomorrow is a 1915 American silent film starring Mary Pickford, produced by Adolph Zukor's Famous Players Film Company and directed by James Kirkwood. It is based on a 1909 stage play starring Eleanor Robson Belmont, her last stage role. This film was rereleased by Paramount in 1919 under their "Success-Series" banner and a copy survives in Sweden today. The story was remade in 1924 again as "The Dawn of a Tomorrow" with Jacqueline Logan in the lead.
Document 9: The Daredevil Men: The Daredevil Men is a 1972 British short subject detailing the activities of stunt performers and stunt arrangers featuring Tom Adams.
Document 10: Gustavo Rol: Upon returning to Italy, in the 1930s he became known in aristocratic and political circles. Rol engaged in various demonstrations of his supposed mystical powers, including telepathy, clairvoyance, and other psychic or magical feats. He also became a friend, among others, of film directors Federico Fellini and Franco Zeffirelli and writer Dino Buzzati. Toward the later part of his life, and after his death, Rol was a focal point of debate in Italy between skeptics and advocates of parapsychology.
Document 11: Things to Come: Things to Come (also known in promotional material as H. G. Wells' Things to Come) is a 1936 British black-and-white science fiction film from United Artists, produced by Alexander Korda, directed by William Cameron Menzies, and written by H. G. Wells. The film stars Raymond Massey, Ralph Richardson, Cedric Hardwicke, Pearl Argyle, and Margaretta Scott.
Document 12: Men of Chance: Men of Chance is a 1931 American pre-Code drama film directed by George Archainbaud, starring Ricardo Cortez, Mary Astor, and John Halliday.
Document 13: Alexander Drankov: We know about this period of Drankov’s life from contradictory accounts of his acquaintances. He first tried to make profit by selling jewellery in Kiev, then moved to Yalta and began shooting pornographic films. In November 1920, he emigrated to Constantinople, where he made his living by either organizing cockroach racing events, according to one account, or by film distribution and maintaining an amusement park, according to another account. In 1922, Drankov moved to the United States of America, where he would buy a mobile cinema projector and show films to Russian immigrants. In 1927, he made an attempt to return to film-making business, but his intention to shoot a major film about a love affair between Nicholas II and ballerina Mathilde Kschessinska turned out to be a failure. After his unsuccessful attempt to gain a foothold in Hollywood, Alexander Drankov opened a café in Venice, California, but soon moved to San Francisco, where he would work in his own photo company until his death on 3 January 1949 in San Francisco. He is buried in Colma, California.
Document 14: María Corda: She began her acting career in the theatres of Budapest in the early days of World War I and soon after the break-up of Austria-Hungary she also began to work in the film industry. Her first role was in "Se ki, se be" in 1919, directed by the Hungarian director, Korda Sandor, who would come to be known as Alexander Korda. She married Sandor, who was then the leading director in Hungary's fledgling film industry, in 1919. He featured her in three films that year "White Rose" ("Fehér rózsa"), "Ave Caesar!" and "Number 111" ("A 111-es") all of which he directed.
Document 15: The Man from Blankley's: The Man from Blankley's is a lost 1930 American pre-Code comedy film, directed by Alfred E. Green. It starred John Barrymore and Loretta Young. The film was based on the 1903 play by Thomas Anstey Guthrie, writing under the pseudonym "F. Anstey". The film was Barrymore's second feature length all-talking film. A previous silent film version of Anstey's play by Paramount Pictures appeared in 1920 as "The Fourteenth Man" starring Robert Warwick. That version is also lost.
ground_truth: Zoltan Korda
sub_queries: A Vanished World >> director Answer: Alexander Korda
Alexander Korda >> sibling Answer: Zoltan Korda