Mary Rowan-Hamilton (died 1951) (1876–1951) Parents Catherine Caldwell Archibald Rowan-Hamilton Children Frederick Nicolson, 2nd Baron Carnock Clementina Nicolson Harold Nicolson Erskine Nicolson, 3rd Baron Carnock Siblings Hariot Hamilton-Temple-Blackwood, Marchioness of Dufferin and Ava Frederick Rowan-Hamilton George Rowan-Hamilton Sidney Rowan Rowan-Hamilton Helen Rowan-Hamilton Gawin Rowan-Hamilton Partners Arthur Nicolson, 1st Baron Carnock