However, I do have a good idea now of what the surname likely is. I will have to go further to confirm it, but out of 58 matches, 13 of them are named McLaughlin or a derivative thereof! So, the surname of John Reid's father was most likely McLaughlin. AND, most of those on the match list named McLaughlin trace their ancestry back to Ireland! So I may be more Irish than I thought.
I joined the McLaughlin dna group through FTDNA, but that group appears to have been abandoned by the group owner, since his email address bounces. I also joined Dougherty, since the second most frequent name on Dad's matches list is Dougherty, or some variation on it. The owner of that group sent me an email and suggested another test I can have done that checks SNPs, and will give us more info on how closely he matches each individual on his list. I don't know what SNPs are, but I am taking his expert advice and have ordered the test. It costs $99, but since I have a $30 credit on my account, it will only cost me $69.
I have done a census search for McLaughlin men in and around Paisley in 1871. I have a list of possible suspects! The best one, so far, is a man named Robert McLaughlin who was boarding with a family in Neilston and working as a worsted weaver, which could have been in the same factory that
Caroline worked in. In 1871 he was 43 years old, and his birthplace is listed as Tyrone, Ireland. He was apparently a single man, unless he had family back in Ireland.
There are several others who are possible suspects too, but I will wait for this new test to come back before spending a lot of time on McLaughlins, in case the results point in another direction. Fingers crossed that this test will be the charm!