Adelaide Blennerhassett (died 1867) (1832–1867) Parents Frances Deane O'Grady Arthur Blennerhassett Children Cecila O'Grady Siblings Henry Deane Blennerhassett Frances Annabella Blennerhassett Charles John Allanson Winn Blennerhassett Dorcas Blennerhassett Amelia Blennerhassett Partners Standish O'Grady, 3rd Viscount Guillamore