Mary Stewart Peerage person ID=459802 (d. 1880) Parents Isabella Agnew Robert Hathorn Stewart of Physgill Children Sir Robert John Hay Mary Stewart Hay Adelaide Louisa Hay James George Baird-Hay Edward Hay Lauderdale Hay Laura Buchan Hay David Hay Agnes Morgan Hay Isabella Agnew Hay Siblings Stair Hathorn-Stewart Partners James Hay