_Gaston I FOIX-GRAILLY _+
                                            | (.... - 1541)          
                       _John FOIX __________|
                      | (1410 - 1485) m 1446|
                      |                     |_Marguerite of ALBRET __
                      |                                              
 _Gaston II FOIX _____|
| (1448 - 1500) m 1494|
|                     |                      _Thomas KERDESTON ______
|                     |                     | (.... - 1446)          
|                     |_Margaret KERDESTON _|
|                        m 1446             |
|                                           |_Elizabeth of LA POLE __+
|                                                                    
|
|--Alain of FOIX 
|  
|                                            ________________________
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|                      _____________________|
|                     |                     |
|                     |                     |________________________
|                     |                                              
|_Isabelle of ALBRET _|
   m 1494             |
                      |                      ________________________
                      |                     |                        
                      |_____________________|
                                            |
                                            |________________________