Oliver St Clair, 12th Baron of Roslin Peerage person ID=145418 Parents William Sinclair, 1st Earl of Caithness Marjory Sutherland Children George Sinclair of Roslin, younger Margaret Sinclair William St Clair, 13th Baron of Roslin Siblings Robert Sinclair Alexander Sinclair Mariot Sinclair Susan Sinclair Arthur Sinclair Katherine Sinclair Lady Elizabeth Sinclair William Sinclair, 3rd Lord Sinclair George Sinclair Sir David Sinclair Eleanor Sinclair William Sinclair, 2nd Earl of Caithness Catherine Sinclair Partners Margaret Borthwick