Family: William De Grandison, 1st Baron Grandison / Sibyl De Tregoz (F870)
m. Bef 1285
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 | John De Tregoz, Lord Of Tregoz  (1227-1300)
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 | Mabel Fitzwarin, Baroness Of Tregoz  (1247-1297)
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| William De Grandison, 1st Baron Grandison (1262-1335) |
| Sibyl De Tregoz (1265-1334)
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| Mabel De Grandison (1294-1349)  |
| Catherine De Grandison (1304-1349) |