Question: Geoffrey G. Butler is the uncle and mentor of a man who was a prominent what? 

Context paragraphs:
Geoffrey G. O'Brien: Geoffrey G. O'Brien (May 10, 1969) is an American poet.  Educated at Harvard University and the University of Iowa, O'Brien has taught at Brooklyn College, The University of Iowa Writers' Workshop and has been the Distinguished Poet in Residence at St. Mary's College of California and the Holloway Lecturer in the Practice of Poetry at the University of California, Berkeley, where he currently teaches.  He also teaches in the Prison University Project at San Quentin.

Butler Bank: Butler Bank is a historic bank building located in downtown Hood River, Oregon, United States, built during Hood River's second major phase of urban development.  It was designed by Portland-based A. E. Doyle (1877–1928), one of the Pacific Northwest's most celebrated architects of the early 20th century, during the later years of his career.  It is one of only two commercial buildings he designed in the Columbia River Gorge region, and his only Egyptian Revival-style commission in Oregon.  It was erected in 1924 for Butler Banking Company, which was led by Leslie Butler (1847–1944).  Butler and his son Truman opened the Butler and Company Bank in 1900 as Hood River's first bank, and incorporated it as the Butler Banking Company in 1905.  Despite early commercial success, it fell victim to the circumstances of the Great Depression and failed in 1932.  The Butlers were regarded as blameless in the failure and continued as respected businessmen.  In addition to his prominent role in business during the early years of Hood River's development, Leslie Butler was very active in voluntary and philanthropic activities throughout Oregon, especially in the area of public health.

Geoffrey G. Butler: Sir George Geoffrey Gilbert Butler (15 August 1887 - 2 May 1929) was an English historian, academic and politician who served as a Member of Parliament for Cambridge University, 1923–1929.  He was uncle of and mentor to Rab Butler, and was an early sponsor of Liddell Hart, a former student who would upon the senior Butler's death that 'I have never had a better friend, in every sense of the word’.  An avid Conservative, he was a significant figure in the intellectual and political history of his party between the World Wars.  In April–May 1917 he was a member of the Balfour Mission, intended to promote cooperation between the US and UK during World War I.

Geoffrey G. Andrews: Geoffrey G Andrews (born in 1961) is an educator and a former director at the Western Academy of Beijing.  Spending most of his career in Ohio he has now began an international job in China.  Geoff has been involved in education for twenty-seven years.  By invitation of the governor of Ohio, Andrews served on the Creativity and Innovation in Education Commission and on the Ohio State task force to redefine educational leadership.

Rab Butler: Richard Austen Butler, Baron Butler of Saffron Walden, (9 December 1902 – 8 March 1982), generally known as R. A. Butler and familiarly known from his initials as Rab, was a prominent British Conservative politician. " The Times" obituary called him "the creator of the modern educational system, the key-figure in the revival of post-war Conservatism, arguably the most successful chancellor since the war and unquestionably a Home Secretary of reforming zeal."  He was one of his party's leaders in promoting the Post-war consensus through which the major parties largely agreed on the main points of domestic policy until the 1970s, sometimes known as "Butskellism" from an elision of his name with that of his Labour counterpart Hugh Gaitskell.

Geoffrey Ward (rugby league): Geoffrey G. Ward is a former professional rugby league footballer who played in the 1950s, and 1960s, playing at representative level for Yorkshire, and at club level for Castleford, as a centre , i.e. number 3 or 4.

Geoff Diehl: Geoffrey G. Diehl is a Republican politician who represents the 7th Plymouth District (Abington, Whitman, and East Bridgewater) in the Massachusetts House of Representatives.  He is a member of the Joint Committee on Housing, House Committee on Global Warming and Climate Change and the House Committee on Technology and Intergovernmental Affairs.  Representative Diehl is also a member of the House Library Caucus and Regional School Caucus.  On November 2, 2010 he upset incumbent Allen McCarthy and was sworn in on January 5, 2011.  He claims to have served as Donald Trump's Massachusetts campaign co-chair during the primary preceding the 2016 Presidential Election.

Geoffrey G Parker: Geoffrey G Parker is a scholar whose work focuses on distributed innovation, energy markets, and the economics of information.  He developed the theory of two-sided markets with Marshall Van Alstyne.

Geoffrey Jones (academic): Geoffrey G. Jones is a British-born business historian.  He became a U.S. citizen in 2010.  He is currently Isidor Straus Professor of Business History at the Harvard Business School.  The previous holders of this Chair, which was the first in the world in business history being founded in 1927, included Alfred D. Chandler, Jr. and Thomas K. McCraw.

Geoffrey G. Slaughter: Geoffrey G. Slaughter (born 1962) is an Associate Justice of the Indiana Supreme Court, appointed to that office by Governor Mike Pence in May 2016.

Supporting paragraphs: Geoffrey G. Butler Rab Butler
Answer: British Conservative politician