Family: William De Grandison, [Sir Knight] / Sybil Tregoz (F6580)
m. Abt 1285/1286
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 | Pierre I Sire Grandson (1190- )
|
 | 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, [Sir Knight] (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, [Cntss Salisbury (1304-1349) |