Family: Second Baron Grandison Peter De Grandison / Blanche De Mortimer (F24082)
m. Bef 20 Jun 1330
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 | 1st Earl of March Roger De Mortimer (1287-1330)
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 | Countess Of March Joan de Geneville (1286-1356)
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| 3rd Lord Mortimer Edmund De Mortimer (1303-1331)  |
| Margaret Mortimer (1304-1337) |
| Maud Mortimer (1307-1346) |
| Countess Of Warwick Katherine Mortimer (1325-1369) |
| Second Baron Grandison Peter De Grandison (1297-1358) |
| Blanche De Mortimer (1313-1347)
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| Isabel de Grandison (1340-1406) |