Mary married William Henry (Dawnay), 7th Viscount Downe on 25 July 1843. William (son of Rev. William Henry (Dawnay), 6th Viscount Downe and Lydia Heathcote) was born on 15 May 1812. [Group Sheet] [Family Chart]

1. Hon. Edith Mary Dawnay died on 15 July 1941.
2. Hon. Alice Isabell Dawnay died on 8 Oct. 1929.
3. Maj.-Gen. Hugh Richard (Dawnay), 8th Viscount Downe was born on 20 July 1844; died on 21 Jan. 1924.
4. Lt.-Col. Hon. Lewis Rayan Dawnay was born on 1 April 1846; died on 30 July 1910.
5. Hon. Alan Charles Dawnay was born on 15 June 1847; died on 3 March 1853.
6. Hon. Guy Cuthbert Dawnay was born on 26 July 1848; died on 28 Feb. 1889.
7. Hon. Eustace Henry Dawnay was born on 15 April 1850; died on 15 Dec. 1928.
8. Hon. William Frederick Dawnay was born on 14 Oct. 1851; died on 29 Sept. 1904 in Brampton House, Northampton, Northamptonshire, England.
9. Hon. Geoffrey Nicolas Dawnay was born on 13 Dec. 1852; died on 31 Dec. 1941.
10. Captain Hon. Francis Herbert Dawnay was born on 11 Dec. 1853; died on 26 June 1914.

Mary married Sidney Leveson Lane on 6 Jan. 1863. [Group Sheet] [Family Chart]