Family: William de GRANDISON / Sybil TREGOZ (F2823)
m. Abt 1285 OR 1286
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 | Pierre I Sire De GRANDSON (1190-1259)
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 | Agnes De NEUCHATEL (1194- )
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| Amadeus De GRANDSON (1229-1300)  |
| John De TREGOZ, LORD (1235-1300)
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| Mabel FITZWARIN (1245-1297)
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| William de GRANDISON (1264-1335)
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| Sybil TREGOZ (1271-1334)
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| Piers (Peter) De GRANDISON, BARON GRANDISON (1286-1358) |
| Agnes GRANDISON (1289-1348) |
| Mabilia De GRANDISON (1294- ) |
| John GRANDISON (1299- ) |
| Katherine de GRANDISON (1304-1349) |