Question: Who is the sibling of the person who directed Struggling Hearts?

full_context: Document 1: 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 2: 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 3: 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 4: 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 5: The Laughing Saskia: The Laughing Saskia (Hungarian: A Nevetö Szaszkia) is a 1916 Hungarian silent drama film directed by Alexander Korda and starring Sari Körmendy, Dezső Kertész and László Békeffi.
Document 6: 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 7: 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 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 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.
Document 10: 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 11: Tommy Atkins (director): Tommy Atkins was an American director of the silent and early sound film eras. Born on July 18, 1887 in Springfield, Massachusetts, he would make his entrance into the film industry as the assistant director to Ralph Ince on the 1920 silent film, "Out of the Snows". It would be another eight years before he would make another film, again as assistant director, this time for FBO Pictures, on another silent film, "Crooks Can't Win". He'd work as the assistant director on another sixteen films between 1928 and 1934, the most notable of which would be 1933's "Morning Glory", directed by Lowell Sherman and starring Katharine Hepburn and Douglas Fairbanks Jr.. In 1934 he would be given the chance to helm his first picture, "The Silver Streak", which was one of the top money-makers for RKO Pictures that year. He would only direct two more films, the second of which, "Hi, Gaucho!", he would also write the story for.
Document 12: Struggling Hearts: Struggling Hearts (Hungarian: Vergödö szívek) is a 1916 Hungarian drama film directed by Alexander Korda and starring Lili Berky, Gyula Gál and Alajos Mészáros.
Document 13: White Nights (1916 film): White Nights (Hungarian: Fehér éjszakák) is a 1916 Hungarian silent drama film directed by Alexander Korda and starring Lili Berky, Kálmán Körmendy and György Kürthy. It was based on the play "Fédora" by Victorien Sardou and is sometimes known by the alternative title Fédora. It was Korda's first film for the Corvin Film studio. It was a major success and was one of the first Hungarian films to be exported to other countries.
Document 14: Harrison and Barrison: Harrison and Barrison (Hungarian: Harrison és Barrison) is a 1917 Hungarian silent comedy film directed by Alexander Korda and starring Márton Rátkai, Dezsõ Gyárfás and Nusi Somogyi. Korda broke from his previous practice of adapting literary works, to direct an original screenplay. The film's style is a madcap one, which relied on the talents of its two stars Rátkai and Gyárfás who were popular comedians. It was Korda's most famous Hungarian film, better known than his literary adaptions. Korda himself considered the film his best work of the period.
Document 15: Tales of the Typewriter: Tales of the Typewriter (Hungarian: Mesék az írógépröl) is a 1916 Hungarian silent drama film directed by Alexander Korda and starring Lili Berky, Jenő Janovics and György Kürthy. It was based on a 1905 novel by István Szomaházy.
ground_truth: Zoltan Korda
sub_queries: Struggling Hearts >> director Answer: Alexander Korda
Alexander Korda >> sibling Answer: Zoltan Korda