Unfortunately, my Joseph Allan/en seems to have left Armagh around 1845, although he did visit on occasion, while living in Dundee, and his second wife, Isobella Fraser, came from Newtownhamilton.
I have absolutely no material on his Armagh family, apart from parents (James Allen and Mary Jane Glassey). There sems to have been a brother/cousin/uncle named Thomas Allen (witness at J's wedding).
Irish records are sketchy and I have been so far unable to piece together the family. Given the habit of naming kin after parents and other relatives, it is possible that your Joseph is a part of my family, but we need far more to go on.
Bruce Allan, Montreal