Resumo
Filho de Henry Sinclair e Egidia Douglas, Countess of Orkney
Filhos (11):
- Arthur Sinclair
- Eleanor Sinclair, Countess of Atholl
- Elizabeth Sinclair
- George Sinclair
- Katherine Sinclair
- Margaret Mariota Sinclair
- Marjory Sinclair
- Oliver Sinclair of Rosslyn
- Robert Sinclair
- William "the Waster" Sinclair, 2nd Lord Sinclair
- William Sinclair, 2nd Earl of Caithness
Casou c/ Elizabeth Douglas, Dowager Countess of Buchan
Casou c/ Marjory Sutherland of Dunbeath
Casou c/ Janet Yeman