Horace Osborne St. John-Mildmay (1817-1866) (1817–1866) Parents Harriet Bouverie Sir Henry St John-Mildmay, 4th Baronet Children Edward Stephen St. John-Mildmay Siblings Augustus Fitzwalter St. John-Mildmay Bouverie Francis Primrose Archibald Primrose, Lord Dalmeny Lady Mary Anne Primrose Lady Harriet Primrose Edmond St John-Mildmay Sir Henry St John-Mildmay, 5th Baronet Partners Jane Dornbach