Family: Baron - John Isaac, - I of Dunfermline / Agnes Grubbe (F13366)
m. 1379
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 | Sir Thomas Isaac (1306-1353)
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 | Matilda (Maud) de Bruce, Priness of Scotland (1303-1353)
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| Robert Grubbe (1315-1377)
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| Margaret Conde (1346-1372) |
| Baron - John Isaac, - I of Dunfermline (1350-1419)
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| Agnes Grubbe (1355-1426)
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| Baron - John Isaac, - II of Patricksbourne (1380-1443)  |
| Thomas Isaac (1385- ) |