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From other info found on the web you appear to be descended from Myrtle Lena.
From Pauline
Hi, Helena (Ellen) Roberts born 1863 at Ballarat. (no other date).
Mother: Mary Ann Corfield (Caulfield), Father: Edward Roberts.
Siblings: Twins Thomas Earl and Henry Roberts born 1865 at Ballarat. (no other date).
Helena died on 6th August 1928 and was buried with William Smith died 2nd January 1929 at Bromley Cemetary.
She lived in New Zealand for 50 years.
Before Helena and William died, they married in Christchurch on the 22nd January 1925 after living together for many years.
The m.c. states William became widowed in 1905 and Helena (spinster). There were 3 children, one son named William who came from William's first marriage to Emily Hawton and two daughters one named Ellen Roberts (my grandmother) and Violet. I have Ellen's (daughter) m.c. from her second marriage, stating that William Smith was her father. The info I have has been calculated from dates on the certificates and what little my own mother knows. If there is anything more specific please let me know.
William stated he was widowed in 1905 and if he is the father of Ellen and Violet, he would have been in a relationship with Ellen while his first wife was alive.
Births
1903/12083
ROBERTS Ellen Mother Ellen Father not recorded
1905
ROBERTS Violet Mother Ellen Father not recorded
So you are seeking information about Ellen between the dates of the last child's birth and her death on 16 Aug 1928.
I note that Orlando Hannival
WINNIE died 14 Apr 1924 aged 77 years ie born c1847. Year of birth same as parish record of his marriage in 1877. He was 16 years older than Ellen.
Have you thought about posting a request on the New Zealand board [and linking this thread] for help with locating information about Ellen and William eg in the electoral rolls?
http://www.rootschat.com/forum/index.php/board,299.0.htmlCheers
Cando