question: When did Bud Roper's father die?
context: [["Elmo Roper", ["Elmo Burns Roper Jr. (July 31, 1900 in Hebron, Nebraska \u2013 April 30, 1971 in Redding, Connecticut) was a pollster known for his pioneering work in market research and opinion polling.", "In 1933, he cofounded Cherington, Wood, and Roper, a marketing research firm.", "When that partnership fell apart, he founded his own research company, Elmo Roper,", "Inc. He was hired by Henry Luce in 1935 to run surveys for \"Fortune\", continuing these surveys for 15 years.", "His prediction of Franklin Delano Roosevelt's electoral victory over Alf Landon in 1936 was correct to within 0.9%; his 1940 prediction of Roosevelt's victory was correct to within 0.5%, further solidifying the reputation of Roper's techniques.", "In 1940, Roosevelt hired Roper to assess public opinion of Lend-Lease prior to its implementation.", "In 1942 he was hired by William Joseph Donovan to be the deputy director of the Office of Strategic Services; Roper subsequently worked with the Office of War Information.", "After leaving the OWI he founded the Roper Center for Public Opinion Research at the University of Connecticut in 1947.", "Roper Opinion Research Company (the \"Roper Poll\") was later renamed Roper Starch Worldwide Company and eventually acquired by NOP World and then GfK in 2005."]], ["Bill Smith (footballer, born 1897)", ["William Thomas Smith( born 9 April 1897, date of death unknown) was an English professional footballer."]], ["Theodred II (Bishop of Elmham)", ["Theodred II was a medieval Bishop of Elmham.", "The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997."]], ["Albert Thompson (footballer, born 1912)", ["Albert Thompson( born 1912, date of death unknown) was a Welsh footballer."]], ["Thomas Scott (diver)", ["Thomas Scott( 1907- date of death unknown) was an English diver."]], ["Harry Wainwright (footballer)", ["Harry Wainwright( born 1899; date of death unknown) was an English footballer."]], ["Etan Boritzer", ["Etan Boritzer( born 1950) is an American writer of children \u2019s literature who is best known for his book\" What is God?\" first published in 1989.", "His best selling\" What is?\" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.", "Boritzer gained national critical acclaim after\" What is God?\" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.", "The other current books in the\" What is?\" series include", "What is Love?,", "What is Death?,", "What is Beautiful?,", "What is Funny?,", "What is Right?,", "What is Peace?,", "What is Money?,", "What is Dreaming?,", "What is a Friend?,", "What is True?,", "What is a Family?,", "What is a Feeling?\"", "The series is now also translated into 15 languages.", "Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.", "His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.", "Boritzer now lives in Venice, California and maintains his publishing office there also.", "He has helped numerous other authors to get published through\" How to Get Your Book Published!\" programs.", "Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.", "He is also recognized nationally as an erudite speaker on\" The Teachings of the Buddha.\""]], ["Harry Johnson (wrestler)", ["Harry Johnson( 1903- date of death unknown) was an English wrestler."]], ["David Vaughan (Wisconsin politician)", ["David Vaughan (February 3, 1822 \u2013 February 28, 1890) was an American farmer, mechanic, and politician.", "Born in North Wales, Vaughan emigrated with his parents to the United States in 1831 and settled in Remsen, New York.", "Vaughan went to public school in Remsen, New York.", "In 1864, he moved to the town of Burns, La Crosse County, Wisconsin.", "He was a farmer and mechanic.", "Vaughan served as justice of the peace for the town of Burns.", "Vaughan served in the Wisconsin State Assembly in 1887 and was a Republican.", "Vaughan died at his home in the town of Burns, Wisconsin."]], ["Bud Roper", ["Burns Worthington \"Bud\" Roper (1925-2003) was an American pollster.", "He was chairman (1967\u201393) of Roper ASW, which was founded as Elmo Roper, Inc. by his father Elmo Roper.", "He was chairman (1970\u201394) of the Roper Center for Public Opinion Research at the University of Connecticut.", "He helped develop industry standards for methodology and the wording of poll questions.", "Two polling controversies occurred during his career; in both cases he showed readiness to admit mistakes."]]]
supporting_facts: [["Bud Roper", 1], ["Elmo Roper", 0]]
evidences: [["Burns Worthington \"Bud\" Roper", "father", "Elmo Roper"], ["Elmo Roper", "date of death", "April 30, 1971"]]
answer: April 30, 1971