Family: Piers (Peter) De GRANDISON, BARON GRANDISON / Blanche De MORTIMER, BARONESS GRANDISON (F2737)
m. Bef 10 Jun 1330
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 | William de GRANDISON (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 (1304-1349) |
| Roger de MORTIMER, Earl of March (1287-1330)
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| Joan de GENEVILLE, Countess of March (1286-1356)
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| Edmund de MORTIMER (1306-1351) |
| Maud De MORTIMER (1307-1345) |
| Roger De MORTIMER (1308- ) |
| Margaret de MORTIMER (1308-1337) |
| Agnes De MORTIMER, COUNTESS OF PEMBROKE (1313-1368) |
| Joane De MORTIMER (1313-1351) |
| John De MORTIMER (1321- ) |
| Beatrice De MORTIMER, BARONESS BREWOSE (1322-1383) |
| Piers (Peter) De GRANDISON, BARON GRANDISON (1286-1358)
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| Blanche De MORTIMER, BARONESS GRANDISON (1316-1347)
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