_______________________
                                                             |                       
                            _________________________________|
                           |                                 |
                           |                                 |_______________________
                           |                                                         
 _Harrison ROBERTSON ______|
| (1822 - 1908) m 1850     |
|                          |                                  _______________________
|                          |                                 |                       
|                          |_________________________________|
|                                                            |
|                                                            |_______________________
|                                                                                    
|
|--Harrison ROBERTSON 
|  (1865 - 1938)
|                                                             _John Curtis MARSHALL _+
|                                                            | (1755 - 1835) m 1783  
|                           _Jaquelin Ambler MARSHALL _______|
|                          | (1787 - 1852) m 1819            |
|                          |                                 |_Mary Willis AMBLER ___
|                          |                                   (1766 - 1831) m 1783  
|_Eliza Clarkson MARSHALL _|
  (1827 - 1868) m 1850     |
                           |                                  _______________________
                           |                                 |                       
                           |_Eliza Letitia Steptoe CLARKSON _|
                             (1798 - 1868) m 1819            |
                                                             |_______________________