Question: Whose son directed Apur Sansar ?

full_context: Document 1: The Inner Eye: The Inner Eye is a 1972 short documentary film made by Satyajit Ray on Benode Behari Mukherjee, a blind artist and a teacher from Visva-Bharati University, a university founded by Rabindranath Tagore at Santiniketan. The twenty minutes documentary features the life and works of Mukherjee in the form of paintings and photographs, starring himself. The documentary covers his journey from childhood till his blindness along with much of his works and features his words, "Blindness is a new feeling, a new experience, a new state of being". The documentary was awarded as Best Information Film (Documentary) at 20th National Film Awards in 1972.
Document 2: Satyajit Ray: Ray directed 36 films, including feature films, documentaries and shorts. He was also a fiction writer, publisher, illustrator, calligrapher, music composer, graphic designer and film critic. He authored several short stories and novels, meant primarily for young children and teenagers. Feluda, the sleuth, and Professor Shonku, the scientist in his science fiction stories, are popular fictional characters created by him. He was awarded an honorary degree by Oxford University.
Document 3: Elements trilogy: Some notable actors that have worked in Mehta's "Elements" trilogy include Aamir Khan, Seema Biswas, Shabana Azmi, John Abraham, Kulbhushan Kharbanda, Rahul Khanna, Lisa Ray, and Nandita Das. A. R. Rahman composed critically acclaimed soundtracks for all the three films. These films are also notable for Mehta's collaborative work with author Bapsi Sidhwa. Sidhwa's novel "Cracking India", (1991, U.S.; 1992, India; originally published as "Ice Candy Man", 1988, England), is the basis for Mehta's 1998 film, "Earth". Mehta's film, "Water," was later published by Sidhwa as the 2006 novel, "Water: A Novel".
Document 4: Sikkim (film): Sikkim is a 1971 Indian documentary about the nation of Sikkim, directed by Satyajit Ray. The documentary was commissioned by the Chogyal (King) of Sikkim at a time when he felt the sovereignty of Sikkim was under threat from both China and India. Ray's documentary is about the sovereignty of Sikkim. The film was banned by the government of India, when Sikkim merged with India in 1975. In 2000, the copyright of the film was transferred to the Art and Culture Trust of Sikkim. The ban was finally lifted by the Ministry of External Affairs (MEA) in September 2010. In November 2010 the director of the Kolkata film festival stated that upon screening the documentary for the first time, he received an injunction from the court of Sikkim again banning the film.
Document 5: Our Films, Their Films: Our Films, Their Films is an anthology of film criticism by noted Bengali filmmaker, composer and writer Satyajit Ray. Collecting articles and personal journal excerpts, it was first published in India in 1976; an English translation was published in The United States and United Kingdom in 1992. Some of articles were previously published in the bulletin of the Calcutta Film Society which Ray co-founded in 1947.
Document 6: Satyajit Ray: Although they were Bengali Kayasthas, the Rays were 'Vaishnavas' (worshippers of Vishnu) as against majority Bengali Kayasthas who were 'Shaktos' (worshippers of the Shakti) .Sukumar Ray died when Satyajit was barely three, and the family survived on Suprabha Ray's meager income. Ray studied at Ballygunge Government High School, Calcutta, and completed his BA in economics at Presidency College, Calcutta then affiliated with the University of Calcutta,(now Kolkata)though his interest was always in fine arts. In 1940, his mother insisted that he studied at the Visva-Bharati University at Santiniketan, founded by Rabindranath Tagore. Ray was reluctant due to his love of Calcutta, and the low opinion of the intellectual life at Santiniketan. His mother's persuasion and his respect for Tagore finally convinced him to try. In Santiniketan, Ray came to appreciate Oriental art. He later admitted that he learned much from the famous painters Nandalal Bose and Benode Behari Mukherjee. Later he produced a documentary film, The Inner Eye, about Mukherjee. His visits to Ajanta, Ellora and Elephanta stimulated his admiration for Indian art.
Document 7: Mrinal Sen: After making five more films, he made a film with a shoestring budget provided by the Government of India. This film, Bhuvan Shome (Mr. Shome, 1969), finally launched him as a major filmmaker, both nationally and internationally. Bhuvan Shome also initiated the "New Cinema" film movement in India.
Document 8: Aparajito: Aparajito ( "Ôporajito"; "The Unvanquished") is a 1956 Indian Bengali drama film written and directed by Satyajit Ray (1921–1992), and is the second part of "The Apu Trilogy". It is adapted from the last one-fifth of Bibhutibhushan Bannerjee's novel "Pather Panchali" (1929) and the first one-third of its sequel "Aparajito" (1932). It starts off where the previous film "Pather Panchali" (1955) ended, with Apu's family moving to Varanasi, and chronicles Apu's life from childhood to adolescence in college, right up to his mother's death, when he is left all alone.
Document 9: Jalsaghar: Jalsaghar ( "Jalsāghar", "The Music Room") is a 1958 Indian Bengali drama film written and directed by Satyajit Ray, based on a popular short story by Bengali writer Tarasankar Bandyopadhyay, and starring Chhabi Biswas. It was the fourth feature film directed by Ray. The shooting was done at Nimtita Raajbari, in Nimtita village, 10 kilometres from Murshidabad.
Document 10: Two (1964 film): Two: A Film Fable is a 1964, black-and-white short film directed by the Indian director Satyajit Ray. The film was made under the banner of Esso World Theater at the request of a non-profit American public broadcasting television, PBS. It was made as part of a trilogy of short films from India. The other two films in the trilogy featured Indian Sitar player, Pandit Ravi Shankar and a Ballet troupe from Mumbai, then known as "Bombay". Ray, who worked prominently for Bengali cinema, was requested to make a film in English language with a Bengali setting, however Ray being an admirer of silent film decided to make a film without any dialogue as a tribute to the genre.
Document 11: Sukumar Ray (film): Sukumar Ray is a 1987 Bengali short documentary film made by Satyajit Ray on his father, Sukumar Ray. It was released during the birth centenary year of Sukumar Ray, who was born on 30 October 1887. The thirty minutes documentary features the life and some of the works by Sukumar Ray in the form of paintings, photographs and readings. This is the last documentary made by Satyajit Ray as a tribute to his father, before he died in 1992. The documentary used Sukumar Ray's photographs and paintings than video recording as the film was considerably a new medium in India when Sukumar Ray died in 1923.
Document 12: The Apu Trilogy: The Apu Trilogy comprises three Bengali films directed by Satyajit Ray: "Pather Panchali" (1955), "Aparajito" (1956) and "The World of Apu" (1959). They are frequently listed among the greatest films of all time and are often cited as the greatest movies in the history of Indian cinema. The original music for the films was composed by Ravi Shankar.
Document 13: Shakha Proshakha: Shakha Proshakha () is a 1990 Satyajit Ray film. It deals with four generations of a well-to-do Bengali family, with a focus on the third generation.
Document 14: Renuka Ray: She was a descendant of Brahmo reformer, Nibaran Chandra Mukherjee, and daughter of Satish Chandra Mukherjee, an ICS officer, and Charulata Mukherjee, a social worker and member of the All India Women’s Conference. She was awarded the Padma Bhushan by the Government of India in 1988.
Document 15: Subrata Mitra: Subrata Mitra (12 October 1930 – 7 December 2001) was an Indian cinematographer. Acclaimed for his work in "The Apu Trilogy" (1955–1959), Mitra is often considered one of the greatest of Indian cinematographers.
ground_truth: Sukumar Ray
sub_queries: Apur Sansar >> director Answer: Satyajit Ray
Satyajit Ray >> father Answer: Sukumar Ray