Eva Sylvia Haines was born 12th October, 1900. Her parents were : Eva Mary (nee Fenn) and Frederick Haselfoot HAINES – he was a keen spider collector, based in Dorset. Their other children were Frederick Merlin HAINES (1898-1964), Gladys Mary HAINES (born 1905) and Rowena Mabel HAINES (born 1908). Rowena was born in 1908 in Winfrith.
Eva Sylvia Haines ‘generally’ went under the name of Sylvia. She was a keen botanist and botanised with her uncle Henry Haselfoot Haines. He acknowledges her help in the preparation of ‘The Botany of Behar and Orissa’ (in the preface). When he died, she was one of the trustees of his estate; his herbarium was bequeathed to Sylvia and Gladys to be divided as they decided.