William Henry Cavendish-Bentinck                          
                         3rd Duke of Portland                                      
                         1738-1809                                                 
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     William Henry Cavendish-Bentinck        Lord Charles Cavendish-Bentinck       
     4th Duke of Portland                    1780-1826                             
     1768-1854                                   |                                 
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     Lady Lucy Joan Cavendish-Bentinck       Rev. Charles Cavendish-Bentinck       
     1807-1899                               1817-1865                             
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     Frederick George Ellis                  Nina Cecilia Cavendish-Bentinck       
     7th Lord Howard de Walden               1862-1938                             
     1830-1899                                   |                                 
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     Thomas Evelyn Scott-Ellis               Lady Elizabeth Bowes-Lyon             
     8th Lord Howard de Walden               1900-2002                             
     1880-1946                                   |                                 
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     Hon. Gaenor Scott-Ellis                 Elizabeth II                          
     1919-                                   Queen of Great Britain                
         |                                   1926-                                 
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     Evelyn Helen Heathcoat-Amory            Charles                               
     1939-                                   Prince of Wales                       
         |                                   1948-                                 
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     Thomas Richard Jacomb                   Prince William of Great Britain       
     1964-                                   Duke of Cambridge                     
                                             1982-