Cremorne married secondly, on 8 May 1770, Philadelphia Hannah, daughter of Thomas Freame of Philadelphia by his wife Margaretta, daughter of William Penn. Their only surviving child, Thomas, died aged sixteen on 9 October 1787,[2] and on 20 November 1797 Cremorne was created Baron Cremorne, of Castle Dawson in the County of Monaghan, with a special remainder, failing the heirs male of his body, to his nephew Richard Dawson and the heirs male of his body.[1]
Lord Cremorne was one of the largest landowners in Ireland, with an annual income from his estates of £8,000 in 1799.[3] He died at Stanhope Street, Mayfair on 1 March 1813. The Viscountcy of Cremorne and the Barony of Dartrey became extinct, while the Barony of Cremorne was inherited by his great-nephew Richard Thomas Dawson. Lady Cremorne died aged eighty-five on 14 April 1826, also at Stanhope Street.[1]