Algernon Charles Dudley Ryder (1847-1943) (1847–1943) Parents Marian Charlotte Emily Cokayne Frederick Dudley Ryder Children Dorothy Evelyn Frances Ryder Cecily Blanche Dorothy Ryder Algernon Frederick Roland Dudley Ryder Philippa Constance Marian Ryder Joan Florence Helen Ryder Mary Constance Eugenia Ryder Hugh Granville Leveson Dudley Ryder Siblings Helena Augusta Cockayne Ryder Stewart Leveson Dudley Ryder Marian Frances Georgiana Ryder Beatrice Mary Frederica Ryder John Edward Dudley Ryder Lionel George Dudley Ryder unknown son Ryder Frederica Constance Dorothy Ryder Hugh Cuthbert Dudley Ryder Partners Constance Eugenia Smith