Family: 1st Baron Grandison William De Grandison / Sibyl De Tregoz (F889)
m. Bef 1285
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 | Lord Of Tregoz John De Tregoz (1227-1300)
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 | Baroness Of Tregoz Mabel Fitzwarin (1247-1297)
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| Sibyl De Tregoz (1265-1334)
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| 1st Baron Grandison William De Grandison (1262-1335) |
| Mabel De Grandison (1294-1349)  |
| Catherine De Grandison (1304-1349) |