_____________________
                                              |                     
                       _______________________|
                      |                       |
                      |                       |_____________________
                      |                                             
 _George DUCKWORTH ___|
| (1807 - 1845) m 1831|
|                     |                        _____________________
|                     |                       |                     
|                     |_______________________|
|                                             |
|                                             |_____________________
|                                                                   
|
|--Robert DUCKWORTH 
|  (1838 - ....)
|                                              _Vintner COBB _______+
|                                             | (1749 - 1805) m 1770
|                      _Ambrose Pinkney COBB _|
|                     | (1775 - 1850) m 1803  |
|                     |                       |_Virginia MORGAN ____
|                     |                         (1750 - 1801) m 1770
|_Catherine COBB _____|
  (1807 - ....) m 1831|
                      |                        _____________________
                      |                       |                     
                      |_Mary Jane ALCORN _____|
                        (1775 - 1850) m 1803  |
                                              |_____________________