Too many John Kellys in Glasgow to be certain, but the 1911 census points definitively to Renfrewshire. Only 5 John Kelly born 1889 to 1891 in Renfrewshire, and 4 of these are in Grennock, so this is the only possible.
1891 Feb 1. Born Renfrewshire.
1891 census at Broomland Street, High Church Paisley
|KELLY, James||Head||Married||M||32||1859|| General Lab
|KELLY, Margaret||Wife||Married||F||30||1861||Glasgow, Lanarkshire|
|KELLY, John||Son||M||0 (3 MO)||1891||Paisley, Renfrewshire|
|MITCHELL, Hughine||Boarder||Unmarried||F||23||1868|| Carpet Factory Worker
1901 census at 49, Broomlands, Paisley
|KELLY, James||Head||Widower||M||42||1859|| Iron Borer (Machine)
|KELLY, John||Son||M||10||1891|| Scholar
|KELLY, James||Son||M||8||1893|| Scholar
|KELLY, Alexr||Son||M||1||1900||Paisley, Renfrewshire|
|MITCHELL, Hughina||Sister-In-Law||Single||F||33||1868|| House Keeper
1911 census, a L/Cpl in 11th Hussars at Lydd Camp, Kent Born Eastwood, Renfrewshire 1891
1914 Aug 15. Landed in France
1915 Oct 12. Commissioned 2nd Lt. The Black Watch (Royal Highlanders'). Serjeant John Kelly, from 11th (Prince Albert's Own) Hussars.
1917 Jul 18 MC Gazetted. Lt. John Kelly, R. Highrs., attd. R. Scots. For conspicuous gallantry and devotion to duty. He personally superintended the bringing up of supplies after going through heavy hostile barrage. It was entirely due to his gallantry and determination that water and food were got up to the battalion each night.
1917 Jul 20. R. Scots. The undermentioned to be actg. Capts. (addtl.): — Lt. J. Kelly, M.C. (R. Highrs.).
1918 Jul 26. Bar to MC Gazetted. Lt. (A./Capt.) John Kelly, M.C., R. Highrs. For conspicuous gallantry and devotion to duty. When heavily attacked he handled his company with coolness, skill and great determination, and, though overwhelmed by numbers, he held his men together and inflicted many casualties on the enemy, and undoubtedly stemmed the attack in his vicinity. (M.C. gazetted 18th July, 1917.
1918 Nov 19. C de G gazetted to Lieutenant (acting Captain) John Kelly, M.C., Royal Highlanders, attached Royal Scots
1921 Jun 1. Joined ADRIC with service no 2017 . Posted to Q Coy
1921 Jun 16. In a tender that was bombed in Dublin
1921 Jun 27. A man spoke to Kelly claiming he was Secret Service
1921 Sep 30 to Oct 26. In hospital
1922 Jan 14. Discharged on demobilisation of ADRIC