Perhaps not quite relevant to the main thread, but it is interesting that I am unable to find any births registered to the SHARMANS, John and Christiana.
There are mentions in the papers ( for example the Obituary of Christiana linked by Cando in Reply #8) of sons and daughter Amelia GIBSON and there are other death records which give John SHARMAN and Christiana as parents, but no birth registration to match!
According to her Obituary she was 82 years in 1909 so born in 1827.
This makes Amelia born before the marriage (surname MARTIN?)
and also Charles SHARMAN (see below) if his age at death is correct.
Harriet Isabel GAVIN, was born seemingly in 1885 , so not possibly a child of the SHARMAN couple
The many spellings of Christiana's surname make things less certain of course

Deaths
SHARMAN William
Father John
Mother Christina NORAX
Death Place PARK
Age 83
Year 1957
Reg 10703
SHARMAN Chas
Father Sharman Jno
Mother Ctine NOAK
Death Place HCOTE
Age 67
Year 1930
Reg 9830
GAVIN Harrt Isobel
Father Sharman Jno
Mother Ctina NOOAH
Death Place KEW
Age 39
Year 1924
Reg 2050
Harriet stated born in Costerfield at her marriage and Mrs SHARMAN was there for a time.
Marriage
SHARMAN Hart Isabel (born COSTERFIELD)
GAVIN Wm Patk
Year 1911
Reg. 6869
Perhaps others will find some births.
Sue