question: Who is the paternal grandfather of Matthew Spender?
context: [["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Matthew Spender", ["Matthew Spender (born 1945) is an English sculptor.", "He is the author of \"From a High Place: A Life of Arshile Gorky\" (1999), a biography of his father-in-law, the artist Arshile Gorky, and \"A House in St John's Wood\" (2015), about his father, the poet Stephen Spender.", "Spender was born in London, England, the son of the poet Stephen Spender and the pianist Natasha Spender."]], ["Ed Bruneteau", ["Edward Ernest H.\" Eddie\" Bruneteau( August 1, 1919 \u2013 July 30, 2002) was an ice hockey right winger.", "He was born in St. Boniface, Manitoba.", "Bruneteau played 181 games with the Detroit Red Wings of the National Hockey League over seven seasons.", "He also coached the Omaha Lancers for 21 games in the 1986 \u2013 87 season leading the team to a 0\u201321 record.", "Ed is the younger brother of\" Mud\" Bruneteau, famous for ending the longest overtime game in NHL history, and the grandfather of Matthew, Brett Bruneteau, and Nick Bruneteau all NCAA Division 1 college hockey players.", "He is also the grandfather of Colton Bruneteau Lower, a Sonar Technician in the United States Navy."]], ["Stephen Spender", ["Sir Stephen Harold Spender (28 February 1909 \u2013 16 July 1995) was an English poet, novelist and essayist who concentrated on themes of social injustice and the class struggle in his work.", "He was appointed Poet Laureate Consultant in Poetry to the United States Library of Congress in 1965."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Fujiwara no Nagara", [", also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.", "He was the grandfather of Emperor Y\u014dzei."]], ["Prithvipati Shah", ["Prithvipati Shah( ?\u20131716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.", "He was the grandfather of Nara Bhupal Shah."]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]]]
supporting_facts: [["Matthew Spender", 1], ["Stephen Spender", 0]]
evidences: [["Matthew Spender", "father", "Stephen Spender"], ["Stephen Spender", "father", "Harold Spender"]]
answer: Harold Spender