Sorry, I will probably be of little help to you - but you might be able to help me?
I have found the MI for a Thomas Crellin who married Eliza. They would have lived in/around the Malew parish, although are buried in St Marks. He was born c.1836 and died (from memory) c.1880.
I would be very interested in hearing from you if you think there might be a connection along the way.
Thanks.