Hi Sue,
It has been a while since I researched this family so there may be further information available now. I am in Canada so thie information I have has been pretty much online.
Effield Hart ATTWATER was the daughter of Richard Marshall and Mary Ann Attwater (Maiden name unknown) If you purchase her birth certificate, it will give you her mother's maiden name.
Sept 1886, Milton, 2a 892.
Effield lived in Hoo during the 1891 & 1901 census. She married Harry Helman on May 25, 1901 at St Mary Chatham, Kent. The image is on the City Arc website.
She had two children that I know of, Cressy and Arnold. This information was given to me by a family member who has now passed. (he was her nephew) I have not searched any further on the children.
Effield had two brother's - Richard and Ernest. Richard died in WW1 on the HMS Cressy. A name that Effield gave her daughter. Ernest married May Eveline Law and went on to have 13 children.
Are you able to give me any further information on you grandmother? Was she Cressy or was there another daughter?
Nancy