____________________________
                                                    |                            
                              _John WILLIAMSON _____|
                             |                      |
                             |                      |____________________________
                             |                                                   
 _Thomas Nicolas WILLIAMSON _|
| (1530 - 1602)              |
|                            |                       _Lancelot Edward THRELKELD _+
|                            |                      | (1435 - 1493)              
|                            |_Isabel THRELKELD ____|
|                              (1510 - 1532)        |
|                                                   |_Elizabeth RATCLIFFE _______+
|                                                     (1462 - 1520)              
|
|--Thomas Robert WILLIAMSON 
|  (1563 - 1610)
|                                                    ____________________________
|                                                   |                            
|                             _John Richard DENTON _|
|                            | (1504 - 1548)        |
|                            |                      |____________________________
|                            |                                                   
|_Alice Ann DENTON __________|
  (1528 - 1573)              |
                             |                       ____________________________
                             |                      |                            
                             |_Margaret MORDAUNT ___|
                               (1509 - 1596)        |
                                                    |____________________________