Mary Powlet Cosby (died 1945) (1864–1945) Parents Alice Sophia Elizabeth Pocock Robert Ashworth Godolphin Cosby Children Burton Desmond Seymour Persse Mary Audrey Persse Sydney Henry Persse Eleanor Alice Persse Siblings Aline Islay Cosby Edith Augusta Emily Cosby Lilian Alice Cosby Violet Grace Cosby Dudley Sydney Ashworth Cosby Sydney George Coventry Cosby Partners William Henry Persse