no trace john
Wrong! 
1891
RG12/3178 35 17
Openshaw, Lancashire
2 Middlewood Street?
John Gloag ,head, 32, Gas Fitter, b. Newton Heath W Manchester
Ellen ,wife, 30, Weaver Cotton, b. Edgehill Liverpool
John, son, 2, b. Openshaw
Mary Elizabeth, dau, 7, scholar, b. do.
Hannah, dau, 1, b. do.
Elenor, dau, 5, scholar, b. do.
Age a bit out but I wouldn't be surprised if this was him in 1881:
http://search.ancestry.co.uk/cgi-bin/sse.dll?db=uki1881&indiv=try&h=10823279
RG11/4009 79 14
Marriage John Gloag - Ellen Grace Sep 1881 Prestwich 8d 434
There is a possible death for him but I can't check - can't see any of them in 1901!
Death John Gloag
March quarter 1901 age 42
Chorlton 8c 508
L/cpl john gloag
1st manchesters
2226
age 26
killed in action 27-12-1914
son of john+ellen gloag,14 kay st,ashton old rd,openshaw
buried in lillers communal cemetery
grave ref III.B.16
pte leonard gloag
2/9th manchesters
enlisted jan 1916
landed in france late 1916
303021
age 19
killid in action 19-11-1917
son of john,t+martha,e gloag,48A buckley st,manchester
still listed as missing,named on tyne cot memorial
mack