Hello I’m back again. I searched the names you gave me. Yes Isabella fagan b 1832 married W J Brown in coleraine and went to NSW in 1855. Her brother William john b 1828 was already in nsw. Then I found another sister Mary Jane b 1826 who also went to NSW. then I found another sister olive esme not sure if she born in Ireland but died in NSW.
I’m not sure if father William john b 1798 in agherton coleraine, with his wife Nancy, went out to NSW and they had olive there. But I can’t track her back to ireland. I suppose I have to find out if the parents came back to Ireland and had Samuel b 1837 in order to make a connection. Confusing to say the least. I have searched Coventry graveyards in coleraine for John fagans burial but nothing so far. Maybe some day a little nugget will put me in the right direction. Thank you.