I have been looking around for the other children's birth reg's - not really come up with much - do you know which were older-and which were younger than Rainey??
They are unusual forenames -so would have thought we could have found them.
I have found Brittania Ward b in 1850's -I know she wouldn't be one of them -but thought maybe it could be a Wrd "family name"

I have found a Brittania lee -birth reg Jun qtr 1920 mother's maiden name lee, IOW 2b 1272 -but suspect this isn't a sister either??
Do you know who the girls married ??
There is a birth reg
Nona Doris Ward mar qtr 1902 chertsey Surrey 2a 45 - I suspect this Nona at sometime married a Mr Gosney???
The only Ward marriage I can find to a Cela/Celia/Cecilia is
in 1900 Camberwell district 1d 967 - Alfred Ward to Celia minnie Ward???
They appear on 1901 census with no children
There is also a birth reg for a Celia minnie Ward in 1870's
I'll wait until there are any more snippets of information you find which may help in the search.
If any information is about the living, please don't post here but send a PM.
Suz