_____________________
                                             |                     
                       _Alexander ROBERTSON _|
                      |                      |
                      |                      |_____________________
                      |                                            
 _John ROBERTSON _____|
|                     |
|                     |                       _John STEWART _______+
|                     |                      |                     
|                     |_Elizabeth STEWART ___|
|                                            |
|                                            |_Eleanor SINCLAIR ___
|                                                                  
|
|--David ROBERTSON 
|  
|                                             _____________________
|                                            |                     
|                      ______________________|
|                     |                      |
|                     |                      |_____________________
|                     |                                            
|_Margaret CRICHTON __|
                      |
                      |                       _____________________
                      |                      |                     
                      |______________________|
                                             |
                                             |_____________________