New Zealand question

[HarrysMum]

I am doing granddaughter’s ‘other side’ and have an issue.

I’m trying to make this work, or prove it wrong.

John Henry Holman born 1846 Cornwall, England marries
Mary Josephine Keefe, born 1852 Sydney, NSW
They marry 30 Dec 1870 Auckland NZ

That is my first issue……I know it’s not impossible but seems a bit odd……read on..

Children
Josiah 1871
Elizabeth 1873
John Henry 1876

All born Thames or Auckland NZ.

Now all the family is back in Qld by the time Josiah dies in 1919. The parents die in Qld.

I can’t find a shipping record. I can find a John Henry Holman in NZ in Papers Past.
I can only think they came out straight after WW1.

Or I have messed up the families completely………lol