__
                                                |  
                           _Hugh WILLIAMSON ____|
                          | (1720 - 1813)       |
                          |                     |__
                          |                        
 _Alden WILLIAMSON Sr.____|
| (1750 - 1816) m 1790    |
|                         |                      __
|                         |                     |  
|                         |_Elizabeth STEWART __|
|                           (1718 - ....)       |
|                                               |__
|                                                  
|
|--William WILLIAMSON 
|  (1805 - ....)
|                                                __
|                                               |  
|                          _____________________|
|                         |                     |
|                         |                     |__
|                         |                        
|_Mary Elizabeth JACKSON _|
  (1772 - ....) m 1790    |
                          |                      __
                          |                     |  
                          |_____________________|
                                                |
                                                |__