I did a search for Aird + Jamaica and was happy to find your post. I noticed that in your post it seems that your grandfather died at 25? or were you indicating that he may have been born between 1890 and 1915?
Well, I was born in Jamaica, as was my father and his father, Dennis C. Aird who died in 1981, not sure of his birthyear. I have often heard stories that our family were merchants from Scotland who travelled and settled in many places. I will be interviewing a great cousin who is said to know a lot more of the family history next month. Email me and I will let you know what I find.I will inquire if he knows an "Alfred Aird" as well.