__
                                            |  
                       _James BUCHANAN _____|
                      | (1702 - 1765)       |
                      |                     |__
                      |                        
 _John BUCHANAN ______|
| (1732 - 1780)       |
|                     |                      __
|                     |                     |  
|                     |_Martha ALLISON _____|
|                       (1705 - 1743)       |
|                                           |__
|                                              
|
|--James BUCHANAN 
|  (1759 - 1816)
|                                            __
|                                           |  
|                      _____________________|
|                     |                     |
|                     |                     |__
|                     |                        
|_Martha BUCHANAN ____|
  (1730 - 1780)       |
                      |                      __
                      |                     |  
                      |_____________________|
                                            |
                                            |__