Family: Thomas ISAAC, (Ysak) / Matilda, Princess of Scotland (F7952)
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 | Thomas ISAAC (1280- ) |
 | Isabel (1278-1320) |
| Robert I, King of Scotland (1274-1329)
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| Elizabeth de BURGH (1289-1327)
|
| Margaret, Princess of Scotland (1300-1346) |
| David II, King of Scotland (1324-1371) |
| John, Prince of Scotland (1327- ) |
| Thomas ISAAC, (Ysak) (1300-1364)
|
| Matilda, Princess of Scotland (1300-1353)
|
| Joanna MAC ISAAC (1319-1369)  |
| Catherine MAC ISAAC (1328- ) |