He had seven daughters but no sons and on his death the title was claimed by his kinsman Alexander Charles Hamilton, the tenth Lord. He was the son of William John Hamilton (Member of Parliament for Newport, Isle of Wight), son of William Richard Hamilton (Permanent Under-Secretary at the Foreign Office), son of the Venerable Anthony Hamilton (Archdeacon of Colchester), son of Alexander Hamilton, younger son of the aforementioned William Hamilton, 3rd of Wishaw. In 1894 his claim was admitted by the House of Lords. He later served as a Scottish Representative Peer from 1900 to 1920. He was succeeded by his nephew, the eleventh Lord. He was an officer in the Indian Army and also sat in the House of Lords as a Scottish Representative Peer between 1922 and 1945. In 1934 he assumed the additional surname of Udny. However, none of the subsequent Lords have held this surname.