George Sinclair, 4th Earl of Caithness Scottish magnate (d. 1582) Parents Elizabeth Sutherland John Sinclair, 3rd Earl of Caithness Children John Sinclair, Master of Caithness Lady Agnes Sinclair Lady Margaret Sinclair unknown Sinclair George Sinclair of Mey Lady Barbara Sinclair William Sinclair of Mey unknown daughter Sinclair David Sinclair Siblings William Sinclair Janet Sinclair unknown daughter Sinclair William Sinclair of Dun Partners Lady Elizabeth Graham