_Phillip PRESTON ____+
                                            | (1711 - 1774)       
                       _Isaac PRESTON ______|
                      | (1741 - 1810)       |
                      |                     |_Mary Ann DOSS ______
                      |                       (1715 - 1820)       
 _Isaac PRESTON ______|
| (1786 - 1849)       |
|                     |                      _____________________
|                     |                     |                     
|                     |_Margaret LNU _______|
|                       (1745 - 1800)       |
|                                           |_____________________
|                                                                 
|
|--Isaac PRESTON 
|  (1823 - ....)
|                                            _____________________
|                                           |                     
|                      _____________________|
|                     |                     |
|                     |                     |_____________________
|                     |                                           
|_Sarah DOWNING ______|
  (1789 - 1856)       |
                      |                      _____________________
                      |                     |                     
                      |_____________________|
                                            |
                                            |_____________________