Hamlin Sinclair King was born October 28, 1894, in Barbados, British West Indies. He came to the United States in 1917, and October 30 of that year he married Ernesta Cummins in New York City.
In 1918 he served with the British Expeditionary Forces during WWI. At that time he was living in Brooklyn with his wife. The following year he traveled from Southhampton, England to New York City on the Mauretania, giving his occupation as "domestic servant." From 1920 through 1930 he was working as a janitor in an apartment house. Sinclair and Ernesta had a son, Steven, born around 1928. By the time of the 1940 census, Sinclair was a widower, with no mention of his son, self-employed as a painter. The advent of WWII in 1942 required him to register for the draft. He was living on Jefferson Ave. in Brooklyn, still working as a painter.
Hamlin Sinclair King died January 4, 1989, at the Ocean Promenade Nursing Center in Far Rockaway, Queens, and was buried on Hart Island.
Sources: U.S. Social Security Death Index; New York, New York Marriage Index, 1866-1937; U.S. Residents Serving in the British Expeditionary Forces, 1917-1919; New York Passenger Lists, 1820-1957; 1920, 1930 and 1940 U.S. Federal Censuses; New York, State Census, 1925; U.S. WWII Draft Registration Cards, 1942.