_Isaac PRESTON ______+
                                            | (1741 - 1810)       
                       _Isaac PRESTON ______|
                      | (1786 - 1849)       |
                      |                     |_Margaret LNU _______
                      |                       (1745 - 1800)       
 _Thomas PRESTON _____|
| (1805 - 1865) m 1856|
|                     |                      _____________________
|                     |                     |                     
|                     |_Sarah DOWNING ______|
|                       (1789 - 1856)       |
|                                           |_____________________
|                                                                 
|
|--Rebecca PRESTON 
|  (1861 - ....)
|                                            _____________________
|                                           |                     
|                      _____________________|
|                     |                     |
|                     |                     |_____________________
|                     |                                           
|_Elizabeth CASTLE ___|
  (1824 - ....) m 1856|
                      |                      _____________________
                      |                     |                     
                      |_____________________|
                                            |
                                            |_____________________