Lady Mary Alice GASCOYNE-CECIL, Duchess of Devonshire
1895 - 1988 (93 years)
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 | William CAVENDISH, Marquis of Hartington 1917-1944 |
| William CAVENDISH, Marquis of Hartington | |
| B: | 10 Dec 1917 |
| D: | 9 Sep 1944 |
| Lady Kathleen KENNEDY, Marchioness of Hartington | |
| B: | 20 Feb 1920 |
| Brookline, Norfolk County, Massachusetts, USA | |
| D: | 13 May 1948 |
| Ste Bauzille, Ardeche, Rhone-Alpes, France | |
| Andrew CAVENDISH, 11th Duke of Devonshire | |
| B: | 2 Jan 1920 |
| D: | 3 May 2004 |
| Deborah MITFORD 1920-2014 |
| Deborah MITFORD | |
| B: | 31 Mar 1920 |
| M: | 1941 |
| D: | 24 Sep 2014 |
| Lady Mary CAVENDISH 1922-1922 |
| Lady Mary CAVENDISH | |
| B: | 1922 |
| D: | 1922 |
| Lady Elizabeth Georgiana Alice CAVENDISH 1926-2018 |
| Lady Elizabeth Georgiana Alice CAVENDISH | |
| B: | 24 Apr 1926 |
| D: | 15 Sep 2018 |
| Lady Anne Evelyn Beatrice CAVENDISH 1927-2010 |
| Lady Anne Evelyn Beatrice CAVENDISH | |
| B: | 9 Nov 1927 |
| D: | 9 Aug 2010 |
| Michael Lambert TREE 1921-1999 |
| Michael Lambert TREE | |
| B: | 1921 |
| M: | 3 Nov 1949 |
| D: | 1999 |
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| Lady Mary Alice GASCOYNE-CECIL, Duchess of Devonshire | |
| B: | 29 Jul 1895 |
| D: | 24 Dec 1988 |
| Lord Edward CAVENDISH, 10th Duke of Devonshire | |
| B: | ay6 May 1895 |
| Stepney, London, Middlesex, England | |
| D: | 26 Nov 1950 |
| Eastbourne, Sussex, England | |