Family: Pier De Grandison, Viscount (F1369)
m. Bef 10 Jun 1330
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 | WILLIAM DE GRANDISON, 1ST Baron,Sir (1255-1335)
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 | SYBIL DE TREGOZ (1271-1334)
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| Mabel Grandison (1292- )  |
| John GRANDISON (1299- ) |
| KATHERINE DE GRANDISON (1304-1349) |
| Agnes de Grandison, Viscountess (1281-1357) |
| Pier De Grandison, Viscount (1286-1358)
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