Mystery solved! For anyone following along on this quarry I will just tell you that one savvy user of FindMyPast has found in one military record the following, which I still can't get to come up in MY search of FindMyPast but it brings me the answer I was hoping for:
First name(s) Alfred Ernest Albert
Next of kin son of the late Albert Harragin
Last name Harragin
Country Trinidad & Tobago
Rank Captain
Notes later Major; MC awarded for gallantry at Damieh Bridgehead, Palestine, 22 September 1918
Battalion 1st Bn
Year 1914-19
Corps British West Indies Regt
Record set Caribbean Rolls Of Honour WW1
Contingent 1st Public Contingent
Category Military, armed forces & conflict
Departure Date 18 September 1915
Subcategory First World War
Troopship HMT Verdala
Collections from Americas, Caribbean
Honours MC
And since then, some other things have come together that give me his mother's name, as well as the names of his wife and children. In addition, I have a family photo. As a side bonus, my search has connected me with a cousin doing research on my own paternal family line still in Trinidad. So, happy days! Thanks all.