Hi Suzi,
1st appearance on 1871 Scotland census, at 40 East Clyde Street, Glasgow
Michael Murnin 70 b 1801 CO Dunn, Ireland Tailor
Jane Murnin 50 b 1821 CO Dunn, Ireland Tailor Wife
Francis Pape 30 b 1841 Cornwall Labourer Son in Law
Amander Pape 1mo b 1871 Glasgow
Ann Murnin 24 b 1847 Manchester Occ - Nurse
William Murnin 18 b 1853 Manchester Occ – Picture Frame Maker
Jane Murnin 16 b 1855 Manchester
So looks if they came to Glasgow from Ireland via Manchester
There was a Francis Pape christened in Sithney Cornwall on 24 Jan 1839
No marriage for Francis Pape, if RC could be no record.
There is another Murnin family on 1871 census, at 69 Craigmark, Dalmellington in Ayrshire
Francis (Farncis) Murnin 49 b 1822 Ireland Occ – Miner
Agnes Murnin 44 b 1827 Ireland
Mary? Murnin 22 b 1849 Airdrie, Lanarkshire Labourer Son
Catherine Murnin 15 b 1856 Airdrie, Lanarkshire
Francis Murnin 10 b 1861 Bathgate, Linlithgowshire Scholar
Peter John Murnin 8 b 1863 Bathgate, Linlithgowshire Scholar
Hugh Murnin 6 b 1855 Bathgate, Linlithgowshire
Michael Murnin 1 b 1870 Coatbridge Lanarkshire
These families could be related, but would need access to Irish records I think.
Tom