__
                                               |  
                                             __|__
                                            |     
                       _John DUCK __________|
                      | (1760 - 1840)       |
                      |                     |   __
                      |                     |  |  
                      |                     |__|__
                      |                           
 _John S. DUCK _______|
| (1809 - ....)       |
|                     |                         __
|                     |                        |  
|                     |                      __|__
|                     |                     |     
|                     |_____________________|
|                                           |
|                                           |   __
|                                           |  |  
|                                           |__|__
|                                                 
|
|--Sarah Elizabeth DUCK 
|  (1845 - ....)
|                                               __
|                                              |  
|                                            __|__
|                                           |     
|                      _____________________|
|                     |                     |
|                     |                     |   __
|                     |                     |  |  
|                     |                     |__|__
|                     |                           
|_Elizabeth HOLMES ___|
                      |
                      |                         __
                      |                        |  
                      |                      __|__
                      |                     |     
                      |_____________________|
                                            |
                                            |   __
                                            |  |  
                                            |__|__