(20 October 1966 - present)
In 1966 he married Alexandra Anastasia "Sacha" Phillips (b. 27 February 1946), eldest daughter of Lt.-Col. Harold Pedro Joseph Phillips (1909–1980) and Georgina Wernher (1919–2011), elder daughter and co-heiress of Sir Harold Wernher, 3rd Baronet, of Luton Hoo, Bedfordshire. She is the elder sister of Natalia, widow of the 6th Duke of Westminster.
The Duke and Duchess of Abercorn have two sons and a daughter:
James Harold Charles Hamilton, Marquess of Hamilton (born 19 August 1969), who was married on 7 May 2004 at the Guards Chapel, Wellington Barracks, to Tanya Marie Nation (born Neuilly-sur-Seine, 30 April 1971), eldest daughter of Douglas Percy Codrington Nation (Rawalpindi, 12 February 1942 – New York City, 2 September 2001), senior managing director of Bear Stearns International Ltd. (1942–2001) and his wife (New York, 10 April 1970, divorced 1989) Barbara "Bobbie" Anne Brookes (1940). They have two children, James Alfred Nicholas Hamilton, Viscount Strabane (born 30 October 2005) and Lord Claud Douglas Harold Hamilton (born 12 December 2007).
Lady Sophia Alexandra Hamilton (born 8 June 1973), who was a model before 1996. She married British war journalist Anthony Loyd in 2002, but their marriage was dissolved, without children, in 2005. Lady Sophia subsequently became engaged to Hashem Arouzi in 2013. She is now co-designer for the fashion label Hamilton-Paris.
Lord Nicholas Edward Claud Hamilton (born 5 July 1979) married 30 August 2009 Tatiana, daughter of Evgeni Kronberg; they have a daughter, Valentina, born 2010.