hanes teulu, I have learnt the hard way never to assume and to verify information.
In respect of Honora, her parents were Henry McCarthy and Margaret McMullen married in NZ in 1885. Both were from Ireland. Henry and Margaret had 4 children born between 1886 - 1890 in NZ. I could not find anything that suggested that either Henry or Margaret had been married or had children before arriving in NZ; so no 'half siblings'. Two of Honora's siblings died young, ie 18 yrs and 20yrs.
Robert Oliver was born in Liverpool according to his military file. I have checked the Lancashire BDM, Lancashire OPC, Ancestry, FindMyPast, Familysearch and contacted Liverpool & SW Lancashire Family History Group - with no success finding Robert's birth.
On this basis I don't agree/accept that Honora was Robert's 'sister'.
I do however wonder if the 'connection' could be through her husband Charles. According to Robert's military file Robert had an Anchor tattoo on his left arm which could suggest that he might have been a mariner at some stage? I do know that Charles in 1911 was a fireman on the ss 'Flora' and was employed by the Union Steamship Company. I have checked with the USS Coy and they could not find any records of a Robert Oliver.
It is possible that Robert knew Charles? As Charles could volunteer/be called up for military service, this is how Honara was Robert's 'Nominated NOK'. Charles was attested at Trentham on 5 May 1916 for WW1.
Have to dash!
Thanks for your interest.
TPB