_____________________
                                            |                     
                       _____________________|
                      |                     |
                      |                     |_____________________
                      |                                           
 _David STEWART ______|
|                     |
|                     |                      _____________________
|                     |                     |                     
|                     |_____________________|
|                                           |
|                                           |_____________________
|                                                                 
|
|--Christian STEWART 
|  
|                                            _Thomas ERSKINE _____+
|                                           |                     
|                      _Alexander ERSKINE __|
|                     |                     |
|                     |                     |_Janet DOUGLAS ______
|                     |                                           
|_Christian ERSKINE __|
                      |
                      |                      _____________________
                      |                     |                     
                      |_Christian CRICHTON _|
                                            |
                                            |_____________________