_William Alexander BUCHANAN _
                                              | (1651 - 1728) m 1669        
                       _Samuel BUCHANAN Sr____|
                      | (1690 - 1783) m 1723  |
                      |                       |_Jean TURNBULL ______________
                      |                         (1655 - 1750) m 1669        
 _Samuel BUCHANAN Jr__|
| (1748 - 1835)       |
|                     |                        _John KEYS __________________
|                     |                       | (1687 - 1748)               
|                     |_Martha Edmiston KEYS _|
|                       (1710 - 1800) m 1723  |
|                                             |_Frances DARNELL ____________
|                                               (1691 - 1770)               
|
|--Virginia Jane BUCHANAN 
|  (1770 - 1840)
|                                              _____________________________
|                                             |                             
|                      _Andrew DUNCAN ________|
|                     | (1720 - 1762) m 1741  |
|                     |                       |_____________________________
|                     |                                                     
|_Elizabeth DUNCAN ___|
  (1748 - 1835)       |
                      |                        _John JENNET ________________
                      |                       | (1698 - 1748)               
                      |_Jane JENNET __________|
                        (1720 - 1791) m 1741  |
                                              |_____________________________