Think the 1851 ages should have read 45 not 75.
Patrick Kerr (as on 1861 census) died at the same address - 97 Saltmarket, Glasgow - on 8/4/1864 of Chronic Bronchitis - aged 60. Shown as married to Catherine McGirvie and informant on death was Peter Kerr, son? (think that's what it is - writing is atrocious).
Patrick's parents are shown as Patrick Kerr, Labourer and Mary nee McMahon (both deceased).
Have looked at 3 different sites and can't find them in 1841 census.
Annette