William Sinclair of Mey Peerage person ID=28449 (b. 1548) Parents George Sinclair, 4th Earl of Caithness Lady Elizabeth Graham Children Patrick Sinclair John Sinclair of Ulbster Siblings unknown daughter Sinclair unknown Sinclair Lady Margaret Sinclair John Sinclair, Master of Caithness Lady Barbara Sinclair George Sinclair of Mey David Sinclair Lady Agnes Sinclair Partners Margaret Mowat