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Isobell Stewart was born in Scotland to Alexander Stewart, 3rd of Garlies (-c1500) and Elizabeth Douglas (-c1500) and died after 1513 Scotland of unspecified causes. She married Thomas MacDowall (-1513) .
Children
| Name | Birth | Death | Joined with |
| Uchtred MacDowall, 8th of Garthland (-c1531) | Scotland | 1531 Scotland | Marion Stewart (-c1531) |
Siblings
| Name | Birth | Death | Joined with |
| Alexander Stewart, 4th of Garlies (-1513) | Scotland | 9 September 1513 Northumberland, England | Elizabeth Kennedy (-aft1513) |
| Isobell Stewart (-aft1513) | Scotland | 1513 Scotland | Thomas MacDowall (-1513) |
| Euphemia Stewart (1454-1525) | 1454 Scotland | 1525 Scotland | Alexander Adair (1445-1513) |