Hi Harvey1949.
Welcome to Rootschat
It should be noted that Nancy, more likely than not, is actually "Anne" or "Agnes"; "Nancy (Nan)" was a pet-form of both.
This looks like the civil registration of John Snr's death:
https://familysearch.org/pal:/MM9.1.1/FTQ6-XM4John HARVEY age 84,
Death Registered Armagh June Qtr 1884
There is a family tree online that has this family.
It says that:
John Sr died 10th May 1884 in Armaghbrague, Armagh.
His wife was Agnes WARNOCK
Their issue was:
Jane born 1831, died 24 Apr 1887 Armaghbrague
James born 1836, died 27 Jul 1892 Dennistoun, Glasgow
John born 8 May 1837 Armaghbrague Armagh, died 4 May 1899 Hastings, Ontario, Canada
Alexander born 1837, died 15 Jun 1887 Armaghbrague
Margaret born 1840 Armaghbrague, died 1 Dec 1917 Scotch Street, Armagh
Robert born 11 Jun 1842 in Armaghbrague died 18 Feb 1916 Hastings, Ontario, Canada
Jonathan born 1845 in Armaghbrague, Keady, Armagh, died 12 Feb 1925 in Armaghbrague
Benjamin born 1849 Armagh, died 18 Jun 1926 in Newtownhamilton, Armagh
Agnes born 1851 Armaghbrague, Keady, Armagh, died 9 Jul 1904 in Rokeby Green, Armagh
Thomas born 1853 Armaghbrague, Armagh, 2 Mar 1917 in 8 McIntyre Street, Glasgow (Anderston), Scotland
Aside from Thomas, no spouses or issue are listed on the tree (although there is a photograph of your John Nr with his wife, captioned as John & Mary Ann HARVEY) but there's quite a bit of info. I think the tree owner might be a descendant of Thomas. Would be well worth your subscribing to the site (or accessing via a Library) and contacting the tree owner.
According to that tree then, no other immigrations outside of the UK - but there are the two who ended up in Scotland. Their death certs of both will be on Scotland's People, and easily purchased (at a very reasonable rate) and downloaded directly from there - both parents (mother & father) should be named on Scottish death certs.
http://www.scotlandspeople.gov.uk/The 1901 & 1911 Irish Census is online (for the siblings who were still living at those times)
Cheers
AMBLY
