_Archambaud GRAILLY ____
                                               | (1330 - 1412)          
                       _Gaston I FOIX-GRAILLY _|
                      | (.... - 1541)          |
                      |                        |_Isabella of FOIX ______+
                      |                          (1361 - 1428)          
 _John FOIX __________|
| (1410 - 1485) m 1446|
|                     |                         ________________________
|                     |                        |                        
|                     |_Marguerite of ALBRET __|
|                                              |
|                                              |________________________
|                                                                       
|
|--Marguerite of FOIX 
|  (1473 - 1536)
|                                               ________________________
|                                              |                        
|                      _Thomas KERDESTON ______|
|                     | (.... - 1446)          |
|                     |                        |________________________
|                     |                                                 
|_Margaret KERDESTON _|
   m 1446             |
                      |                         _Michael of the POLE ___
                      |                        | (1367 - 1415)          
                      |_Elizabeth of LA POLE __|
                                               |
                                               |_Katherine of STAFFORD _
                                                 (1376 - 1419)