Charles Augustus Sinclair (1865-1944) (1865–1944) Parents James Augustus Sinclair, 16th Earl of Caithness Janet Macleod Children Lady Janet Sinclair Roderick Sinclair, 19th Earl of Caithness Euphemia Sinclair Lady Nicola Marianne Sinclair Lady Margaret Alison Sinclair Siblings Lady Mary Jessie Sinclair Lady Meredith Isabel Sinclair Lady Euphemia Wilhelmina Sinclair Lady Margaret Helen Sinclair George Arthur Sinclair John Sutherland Sinclair, 17th Earl of Caithness Norman Macleod Buchan of Auchmacoy, 18th Earl of Caithness Partners Mary Ann Harman