| Father | Earl Henry Sinclair (1347 - 1404) |
| Mother | Jean Haliburton (1358 - 1400) |
| Sibling | Henry Sinclair 2nd Earl of Orkney (1373 - 1421) |
| Sibling | Lady Elizabeth Sinclair Countess of Stobhall and Cargill (1363 - 1460) |
| Sibling | Jean Sinclair of Orkney (1364 - 1391) |
| Sibling | Mary Sinclair of Orkney (1370 - ) |
| Sibling | Margaret Sinclair Of Orkney (1375 - 1450) |
| Sibling | John Sinclair of Kirkton, Lord of Shetland (1376 - ) |
| Sibling | Lady Marjory Sinclair of Roslyn Castle (1376 - ) |
| Sibling | Beatrice Sinclair (1394 - 1428) |
| Sibling | Sinclair wife of Cockburn ( - ) |
| Sibling | Sinclair wife of Heron ( - ) |