When Andrew Samuel Thomson was born on 11 September 1866, in Escott, Leeds and the Thousand Islands, Leeds and Grenville, Ontario, Canada, his father, John Kincaid Thomson, was 45 and his mother, Nancy Root, was 45. He married Ida May Fiske on 22 June 1899, in Littleton, Middlesex, Massachusetts, United States. He lived in Amherst, Hampshire, Massachusetts, United States for about 11 years and United States in 1951. He died in 1951, in Massachusetts, United States, at the age of 85, and was buried in Amherst, Hampshire, Massachusetts, United States.