 In 1870, Cholmondeley succeeded to his elder brother's title as the third Marquess of Cholmondeley and entered the House of Lords.On 28 February 1825, Cholmondeley married Marcia Emma Georgiana Arbuthnot, daughter of Charles Arbuthnot, at Cholmondeley House, which was then in Piccadilly, London.They had eight children, of whom only two daughters survived him