Lady Margaret Sinclair Peerage person ID=392100 (1937–2021) Parents George Sinclair, 4th Earl of Caithness Lady Elizabeth Graham Children James Sutherland, 1st of Kinminity Christian Mackay Janet Sutherland William Sutherland, 10th of Duffus Siblings William Sinclair of Mey unknown daughter Sinclair unknown Sinclair John Sinclair, Master of Caithness Lady Barbara Sinclair George Sinclair of Mey David Sinclair Lady Agnes Sinclair Partners William Sutherland, 9th of Duffus Huistean Du Mackay, 14th of Strathnaver