Hi Lu
..... Of course, if you can find a link between these Allens and Fred Allen who played rugby for the All Blacks in the 1940s/1950s (or steer me in the direction to look) that would answer a different question we have 
Hi again Kat
Yes, may be able to help sort this, but would like for you to supply details firstly for your George ALLEN (later apparently known as "George Josiah ALLEN").
- George, born Sydney ?? ... is that correct ?
- Confirmation of George's father's name
[Noting that NZ Marriage cert. copy, shows father as "Jos. " - which could represent either "Joseph or Josiah" ?? ]
- Father's birthplace ?
Question: Why do you think there may be a link to New Zealand's "Fred ALLEN" (akaSir Frederick Richard ALLEN") ?
~ Lu
Hi Lu
I have no further details about George Josiah Allen - other than I 'believe' he was born in Chippendale, a suburb of Sydney. Then moved to NZ and in early 1890s he definitely had Allendale House built at 50 Ponsonby Road Ponsonby. Then moved back to Australia with his wife and children in the early 1900s
I had thought that there might have been some older Allen children remaining in NZ who might have been related to Sir Frederick Allen however with further research it doesn't appear so. My dodgy Googling since my previous post indicates that GJ Allen returned to Australia with his wife and all his children
The family lived at Randwick, a suburb of Sydney, where they built a new Allendale home on Alison Road Randwick. GJ Allen's two daughters married two Veech brothers. Just to add some randomness in - both those brothers were from a country town in NSW called Wellington

One of the family farms at Wellington NSW was called Remuera!
GJ Allen's daughter Anne Margaret Allen (known as Tottie), married Dr Michael Stanislaus Veech. They were my Great Grandparents