Welcome cousin,
My GGG Grandparents were David Hamiltom and Catherine Young. Their son, John, who stayed in Ireland was my GG Grandfather. He moved from Ballygawley to Milford, Armagh, where they had seven children, who ended up in Ireland, England, Penang and the US. Their descendants went to Canada, Scotland, Wales, Australia, New Zealand etc. My G Grandfather taught in Penang, Straits Settlements for many years, my Grandfather immigrated to Canada.
Unfortunately my computer is away being serviced so don't have access for several days but will have to back to you re specifics.
I had uncovered quite a bit about the Australian relatives, including Margaret when I had my Ancestry subscription - no longer have it. I found a lot of info on Trove.
I have not been able to find out anything further back about David or Catherine yet....
I do suspect some relatives settled in New Zealand, possibly cousins, but have not been able to verify actual connection.
I am in Canada.
J