Family: Peter De Grandison, Second Baron Grandison / Blanche De Mortimer (F23687)
m. Bef 20 Jun 1330
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 | Roger De Mortimer, 1st Earl of March  (1287-1330)
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 | Joan de Geneville, Countess Of March  (1286-1356)
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| Edmund De Mortimer, 3rd Lord Mortimer (1303-1331)  |
| Margaret Mortimer (1304-1337) |
| Maud Mortimer (1307-1346) |
| Katherine Mortimer, Countess Of Warwick (1325-1369) |
| Blanche De Mortimer (1313-1347)
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| Peter De Grandison, Second Baron Grandison (1297-1358) |
| Isabel de Grandison (1340-1406) |