I think I may have known one of your grandfather's brothers, Mr. Jacob LEONARD. If I'm correct, this gentleman lived across the gut from my family home at Kongens Gade (Education Street) on St. Thomas in my youth-- from the late 1950's to about the 70's or 80's when he died.
His grandson, 'Charlie-Boo' now lives in the house. It's painted an orange-ish color. Hope this helps.