Family: Piers (Peter) De Grandison, [BARON GRANDISON / Blanche De Mortimer, [BARONESS GRANDI (F6579)
m. Bef 10 Jun 1330
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![William De Grandison, [Sir Knight]](img/male.jpg){kind=small} | William De Grandison, [Sir Knight] (1264-1335)
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 | Sybil Tregoz (1271-1334)
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| Agnes Grandison (1289-1348) |
| Mabilia De Grandison (1294- )  |
| John Grandison (1299- ) |
| Katherine De Grandison, [Cntss Salisbury (1304-1349) |
| Roger Mortimer, [EARL OF MARCH] (1287-1330)
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| Joan De Geneville, [Countess of Mar (1286-1356)
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| Joane De Mortimer, [Baroness Audley (1313-1351) |
| Maud De Mortimer (1307-1345) |
| Margaret De Mortimer (1308-1337) |
| Agnes De Mortimer, [Countess of Pem (1313-1368) |
| Beatrice De Mortimer, [Baroness Brewos (1322-1383) |
| Roger De Mortimer (1308- ) |
| John De Mortimer (1321- ) |
| Edmund De Mortimer, [Sir Knight] (1306-1351) |
| Piers (Peter) De Grandison, [BARON GRANDISON (1286-1358)
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| Blanche De Mortimer, [BARONESS GRANDI (1316-1347)
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