 His first marriage was to Heather Mildred Carmichael Bell, daughter of Lt.-Col. Richard Carmichael Bell and Mildred Charlotte Davidson-Houston, on 4 February 1926.One child was born of this marriage, Robert Anthony Carmichael Hamilton, on 27 February 1927, who eventually succeeded to the title.On 21 March 1942, after a divorce from his first wife in 1941, he married Cyrilla Mary Binns, daughter of Raymund Louis Binns (late the Yorkshire Regiment, killed in action in 1916) and Maud Cartman.