Family: WILLIAM DE GRANDISON, 1ST Baron,Sir / SYBIL DE TREGOZ (F1022)
m. Abt 1285/1286
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 | AMADEUS DE GRANDSON (1229-1300)
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 | Benoite De La Tour, Viscountess of Grandison (1233-1279)
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| John 1st Baron De Tregoz, Sir (1222-1300)
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| Mabel Fitzwarin (1228-1297)
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| Clarice De Tregoz (1262-1300)  |
| WILLIAM DE GRANDISON, 1ST Baron,Sir (1255-1335)
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| SYBIL DE TREGOZ (1271-1334)
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| Mabel Grandison (1292- ) |
| John GRANDISON (1299- ) |
| KATHERINE DE GRANDISON (1304-1349) |
| Pier De Grandison, Viscount (1286-1358) |
| Agnes de Grandison, Viscountess (1281-1357) |