Family: IV Earl of Angus George Douglas / Lady Isabel Sibbald (F1157)
2nd Earl of Angus William Douglas (1402-1437) 
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| John Sibbald (1402-1457) |
| IV Earl of Angus George Douglas (1428- )
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Lady Isabel Sibbald (1431-1501)
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Earl of Angus Archibald Douglas, V (1453- )  |
