Question: Who is John Kemys Spencer-Churchill's paternal grandfather?

Knowledge 1: John Kemys Spencer-Churchill
John Kemys George Thomas Spencer-Churchill (27 December 1835 – 9 August 1913) was an administrator in the British colonial service serving as Governor of Montserrat and Commissioner of St Kitts and Nevis.Spencer-Churchill was the second son of Lord Charles Spencer-Churchill born on 27 December 1835.He was educated at Winchester College and joined the Army in 1854 serving at the siege of Sebastapol.After leaving the Army he joined the colonial service in the West Indies where he held a number of administrative appointments, including President of the British Virgin Islands from 1879 to 1882, Governor of Montserrat from 1888 to 1889 and Commissioner of St Kitts and Nevis from 1889 to 1895. [SEP] Knowledge 2: Lord Charles Spencer-Churchill
Lord Charles Spencer-Churchill (3 December 1794 – 28 April 1840) was a British army officer and politician.He was the second son of George Spencer-Churchill, 5th Duke of Marlborough and Lady Susan Stewart, daughter of John Stewart, 7th Earl of Galloway.
Knowledge 1: John Kemys Spencer-Churchill
John Kemys George Thomas Spencer-Churchill (27 December 1835 – 9 August 1913) was an administrator in the British colonial service serving as Governor of Montserrat and Commissioner of St Kitts and Nevis.Spencer-Churchill was the second son of Lord Charles Spencer-Churchill born on 27 December 1835.He was educated at Winchester College and joined the Army in 1854 serving at the siege of Sebastapol.After leaving the Army he joined the colonial service in the West Indies where he held a number of administrative appointments, including President of the British Virgin Islands from 1879 to 1882, Governor of Montserrat from 1888 to 1889 and Commissioner of St Kitts and Nevis from 1889 to 1895. [SEP] Knowledge 2: Gladys Spencer-Churchill, Duchess of Marlborough
Gladys Marie Spencer-Churchill, Duchess of Marlborough ("née" Deacon; 7 February 1881 – 13 October 1977) was a French American aristocrat and socialite.She was the mistress and later the second wife of Charles Spencer-Churchill, 9th Duke of Marlborough.
Knowledge 1: John Kemys Spencer-Churchill
John Kemys George Thomas Spencer-Churchill (27 December 1835 – 9 August 1913) was an administrator in the British colonial service serving as Governor of Montserrat and Commissioner of St Kitts and Nevis.Spencer-Churchill was the second son of Lord Charles Spencer-Churchill born on 27 December 1835.He was educated at Winchester College and joined the Army in 1854 serving at the siege of Sebastapol.After leaving the Army he joined the colonial service in the West Indies where he held a number of administrative appointments, including President of the British Virgin Islands from 1879 to 1882, Governor of Montserrat from 1888 to 1889 and Commissioner of St Kitts and Nevis from 1889 to 1895. [SEP] Knowledge 2: John Christian Kunkel
John Christian Kunkel (September 18, 1816 – October 14, 1870) was a Whig and Republican member of the U.S. House of Representatives from Pennsylvania.He was the grandfather of John Crain Kunkel.

Answer: George Spencer-Churchill, 5th Duke of Marlborough