James Augustus Sinclair, 16th Earl of Caithness (1827-1891) (1827–1891) Parents John Sutherland Sinclair Euphemia Buchan Children Lady Mary Jessie Sinclair Lady Euphemia Wilhelmina Sinclair Norman Macleod Buchan of Auchmacoy, 18th Earl of Caithness Charles Augustus Sinclair Lady Margaret Helen Sinclair Lady Meredith Isabel Sinclair George Arthur Sinclair John Sutherland Sinclair, 17th Earl of Caithness Siblings Thomas Buchan Sinclair Nicola Helen Meredith Sinclair Euphemia Margaret Sinclair Charles Home Sinclair Partners Janet Macleod