Harold Blackett (1854-1923) (1854–1923) Parents Emily Jane Cockcraft John Charles Blackett Children Kathleen Marion Blackett Henry Beaumont Blackett Siblings Louisa Blackett John Charles Blackett Evelyn Blackett Nesta Mary Blackett Arthur Vere Blackett Emily Blackett Henry Blackett Florence Blackett Edith Blackett Ida Frances Blackett unknown daughter Blackett Mary Patience Blackett Partners Marion Gosling