Question: The ruler during the Tiananmen square protests of the country first to buy the Curtiss P-36 Hawk fathered what son?

full_context: Document 1: China's Wings: China's Wings: War, Intrigue, Romance and Adventure in the Middle Kingdom during the Golden Age of Flight is a 2012 book by Gregory Crouch, published by Bantam Books. The book discusses the history of the China National Aviation Corporation (CNAC) and is focused on William Langhorne Bond as the central character. Harry Eagar of the "Maui News" stated that "is largely a biography of Bond." The book also describes Moon Fun Chin, a Chinese-American who rose from peasant roots, to become a lead CNAC pilot and finally to owning his own airline. Among other events, the book discusses the establishment of the first airline in China, the Second Sino-Japanese War, "The Hump" airlift, and the 1938 Kweilin incident. The book ends after the 1949 Communist takeover.
Document 2: Bombard the Headquarters: It is commonly believed that this "big-character poster" directly targeted Chinese President Liu Shaoqi and senior leader Deng Xiaoping, who were then in charge of Chinese government's daily affairs and who tried to cool down the mass hysteria which had been coming into shape in several universities in Beijing since the May 16 Notice, through which Mao officially launched the Cultural Revolution, was issued.
Document 3: 2008 Summer Olympics torch relay: China: In China, the torch was first welcomed by Politburo Standing Committee member Zhou Yongkang and State Councilor Liu Yandong. It was subsequently passed onto CPC General Secretary Hu Jintao. A call to boycott French hypermart Carrefour from May 1 began spreading through mobile text messaging and online chat rooms amongst the Chinese over the weekend from April 12, accusing the company's major shareholder, the LVMH Group, of donating funds to the Dalai Lama. There were also calls to extend the boycott to include French luxury goods and cosmetic products. According to the Washington Times on April 15, however, the Chinese government was attempting to "calm the situation" through censorship: "All comments posted on popular Internet forum Sohu.com relating to a boycott of Carrefour have been deleted." Chinese protesters organized boycotts of the French-owned retail chain Carrefour in major Chinese cities including Kunming, Hefei and Wuhan, accusing the French nation of pro-secessionist conspiracy and anti-Chinese racism. Some burned French flags, some added Nazism's Swastika to the French flag, and spread short online messages calling for large protests in front of French consulates and embassy. The Carrefour boycott was met with anti-boycott demonstrators who insisted on entering one of the Carrefour stores in Kunming, only to be blocked by boycotters wielding large Chinese flags and hit by water bottles. The BBC reported that hundreds of people demonstrated in Beijing, Wuhan, Hefei, Kunming and Qingdao.
Document 4: Shi Tiesheng: In 1969 he was a "sent-down youth" or urban youth sent to a rural area of Shaanxi as part of the Down to the Countryside Movement of the Cultural Revolution. There he was paralyzed in an accident at the age of 21, and was sent back to Beijing.
Document 5: Zhang Lifan: Zhang's father, Zhang Naiqi (), was one of the founders of the China National Democratic Association, Zhang's mother is Zhang Caiping (). Zhang spent his childhood in his hometown of Beijing. He attended High School attached to Tsinghua University (). In 1957, Zhang Naiqi, Zhang Bojun (), Chu Anping () and Luo Longji () were picked out as right wingers. On 8 June 1957, Zhang Naiqi was removed from his posts and taken to be prosecuted. Zhang Lifan was punished because of his father. On 13 May 1977, Zhang Naiqi died of illness in a Beijing Hospital basement. After the Cultural Revolution, Zhang Lifan was educated in the Institute of Modern History of Chinese Academy of Social Sciences ().
Document 6: Yang Shangkun: Yang Shangkun (3 August 1907 – 14 September 1998) was President of the People's Republic of China from 1988 to 1993, and was a powerful Vice Chairman and Secretary-General of the Central Military Commission under Deng Xiaoping. He married Li Bozhao in 1929, one of the few women to participate in the Long March, as did Yang.
Document 7: Deng Pufang: Deng Pufang () (born 16 April 1944) is the first son of China's former Paramount leader Deng Xiaoping. He is mostly known for being crippled by the Red Guards and becoming a paraplegic. He has since dedicated his life to improving the rights of people with disabilities.
Document 8: Curtiss Eagle: The Curtiss Eagle (retroactively designated the Model 19 by Curtiss some years later) was an airliner produced in small numbers in the United States shortly after World War I. The aircraft was a conventional biplane with three-bay, unstaggered wings of equal span. The fuselage was a very advanced design for its day, incorporating careful streamlining of its monocoque structure, and offering the crew as well as the passengers a fully enclosed cabin. The Eagle is sometimes named as the first American tri-motor aircraft; however Curtiss' own Model H flying boat flew with three engines for a time in 1914 before being converted back to twin-engine configuration.
Document 9: Deng Xiaoping: Between 1927 and 1929, Deng lived in Shanghai, where he helped organize protests that would be harshly persecuted by the Kuomintang authorities. The death of many Communist militants in those years led to a decrease in the number of members of the Communist Party, which enabled Deng to quickly move up the ranks. During this stage in Shanghai, Deng married a woman he met in Moscow, Zhang Xiyuan.
Document 10: Curtiss P-36 Hawk: Internal company designation for a simplified export version with fixed landing gear, two slightly differing aircraft built, first sold to China, second to Argentina
Document 11: Zhang Baosheng: Some high-ranking Communist Party leaders in Beijing grew curious at reports of Zhang's alleged powers, and Zhang was one of the "Healers with Extraordinary Powers" invited into the Zhongnanhai leadership compound to treat the daughter-in-law of General Chen Geng.
Document 12: Xian H-6: Delivery of the Tu-16 to China began in 1958, and the Xi'an Aircraft Industrial Corporation (XAC) signed a licence production agreement with the USSR to build the type in the late 1950s. The first Chinese Tu-16, or "H-6" as it was designated in Chinese service, flew in 1959. Production was performed by the plant at Xian, with at least 150 built into the 1990s. China is estimated to currently operate around 120 of the aircraft.
Document 13: 1989 Tiananmen Square protests: Party and government leaders Name Position (s) in 1989 Deng Xiaoping Chairman of the Central Military Commission; de facto ``paramount leader ''Chen Yun Chairman of the CPC Central Advisory Commission Zhao Ziyang General Secretary of the Communist Party of China First Vice-Chairman of the Central Military Commission Li Peng Premier of the People's Republic of China Qiao Shi Secretary of the CPC Central Commission for Discipline Inspection Secretary of the CPC Political and Legislative Affairs Committee Hu Qili First Secretary of the Secretariat of the Communist Party Yao Yilin First Vice Premier of the People's Republic of China Yang Shangkun President of the People's Republic of China Vice-Chairman of the Central Military Commission Li Xiannian Chairman of the Conference National Committee Wan Li Chairman of the Congress Standing Committee Wang Zhen Vice President of the People's Republic of China Jiang Zemin Communist Party Shanghai Municipal Secretary Li Ximing Communist Party Beijing Municipal Secretary Zhu Rongji Mayor of Shanghai Chen Xitong Mayor of Beijing Hu Jintao Communist Party Tibet Regional Secretary Wen Jiabao Chief of the General Office of the Communist Party of China Bold text indicates membership in the Politburo Standing Committee Italics text indicates Great Eminent Officials
Document 14: Dissolution of the Soviet Union: In the fall of 1985, Gorbachev continued to bring younger and more energetic men into government. On September 27, Nikolai Ryzhkov replaced 79-year-old Nikolai Tikhonov as Chairman of the Council of Ministers, effectively the Soviet prime minister, and on October 14, Nikolai Talyzin replaced Nikolai Baibakov as chairman of the State Planning Committee (GOSPLAN). At the next Central Committee meeting on October 15, Tikhonov retired from the Politburo and Talyzin became a candidate. Finally, on December 23, 1985, Gorbachev appointed Yeltsin First Secretary of the Moscow Communist Party replacing Viktor Grishin.
Document 15: Cessna 172: The Cessna 172 Skyhawk is an American four - seat, single - engine, high wing, fixed - wing aircraft made by the Cessna Aircraft Company. First flown in 1955, more 172s have been built than any other aircraft.
ground_truth: Deng Pufang
sub_queries: What country was sold to first? Answer: China
who ruled China during the tiananmen square protests of 1989 Answer: Deng Xiaoping
Deng Xiaoping >> child Answer: Deng Pufang