If Barnaby Joyce is a Kiwi

then I am a Scot...I think.
Barnaby Joyce is Downunder's Deputy Prime Minister. His father is a Kiwi married to a Downunderite. Joyce was born in Australia. Another citizenship row has erupted because the Kiwis claimed Joyce as one of their own.
Really? 
I thought about this. I am still thinking about it. My paternal great-grandparents were Scots, from Caithness. They migrated here in the late 1800s. They had eleven children.
Now, if Joyce is a Kiwi because his father was a Kiwi, those children have to be Scots. Right? That means my paternal grandfather was a Scot. He certainly never renounced his Scots citizenship. He was very proud of it. He belonged to the local Caledonian Society and was an office-holder in it. He made sure his children and grandchildren were aware of their heritage. There is a strong sense of "clan" in the extended family - our family reunions are known as clan gatherings thankyou very much. 
Now if my grandfather was a Scot then his children have to be Scots - yes? And that makes me a Scot as the child of a Scot?
You can start to see how awkward all this gets. 
There are vast numbers of people who claim "indigenous" heritage - even where that heritage may be of the order of a single great-great grandparent. At the present time we allow people to claim they are "indigenous" on that basis - they simply need to be acknowledged by others with similar claims as being "indigenous". It completely ignores their other ancestry.  If Joyce had an indigenous mother or maternal grandparent (and, as far as I know, he doesn't) and had claimed indigenous heritage would this issue even have come up?
Two of my nephews have a parent who is the son of Greek-Cypriot migrants. Is their father a Greek-Cypriot although he was born in Downunder? Are they Greek-Cypriot although their "perhaps-Scots" mother was born in Downunder?
Where does this row leave me and my siblings and my cousins? Are we Downunderites or Scots? I would have absolutely no objection to being held to be Scots. My siblings and cousins would not object either  but we have always assumed we are Downunderites.
It's time to sort the issue out.