During which years did the father of Maurice Macmillan serve as Prime Minister of the United Kingdom?
Harold Macmillan Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac", he was known for his pragmatism, wit and unflappability.
Sir Charles Trevelyan, 3rd Baronet Sir Charles Philips Trevelyan, 3rd Baronet, {'1': ", '2': ", '3': ", '4': "} (28 October 1870 – 24 January 1958) was a British Liberal Party, and later Labour Party, politician and landowner. He served as President of the Board of Education in 1924 and between 1929 and 1931 in the first two Labour administrations of Ramsay MacDonald.