Managed to find census records for the Abbey Poorhouse for 1871 and don't see any sign of Caroline, so another dead end I'm afraid.
Isobel
Oh, DARN! Well thank-you so much for looking! At least I can rule out that she was living at Abbey Poorhouse in 1871. Since her first child (1870) was not born there, I'm not surprised that she wasn't there. She probably ended up there somehow to give birth to the second son (1872). She was definitely at # 9 Collier Street in Johnstone, Paisley Abbey, Renf. in 1861. She turns up in Neilston to have her son in 1870. I believe they are only a few miles apart? Then she has John in 1872 in Paisley and dies in 1881 in Neilston.
One funny thing that turned up when I was just playing around with my dna matches. I don't think this is the "answer" I'm searching for, but for a few moments it sure seemed possible! I did a mirror tree with the one person who is a dna match to both me and to my cousin's daughter (who is on my Dad's side/Reid side of the family). The name Bird came up in common. Just for giggles, I plugged in a search for a Bird male born about Caroline's birth year in the Paisley area. One popped up, a man named Charles Micheal Bird, born 1848 (same as Caroline) in Paisley. What caught my eye was that his occupation was listed as "clerk at prison". For a moment I thought well maybe they were referring to the poorhouse, as sometimes the same building would house prisoners, etc. Then I saw that this Charles's father was Prison Governor at Paisley prison, and realized they actually did mean the prison, so I dropped that theory for the present. I suppose Caroline could have been in the Paisley prison, who knows. But that is the kind of info I'll be looking for to identify John Reid's father. A long shot, but fun to try!