Lady Mary Cornwallis (1804-1872) (1804–1872) Parents Louisa Cornwallis, Marchioness of Cornwallis Charles Cornwallis, 2nd Marquess Cornwallis Children Mary Jemima Ross Alexander Henry Ross Louisa Ross Siblings Lady Elizabeth Cornwallis Lady Jane Cornwallis Lady Louisa Cornwallis Lady Jemima Cornwallis Partners Charles Ross