[1] He was the son of John Guion and Maria Howe of Westchester County, New York.
William had a younger brother Stephen Barker Guion which was one of the "Williams & Guion Black Star Line" founders.
[2] Stephen Barker Guion passed through the Atlantic Ocean to Liverpool in 1852 where he was acted as an agent of the "Williams & Guion Black Star Line".
[3][1] The elder brother William Howe Guion joined the office in New York City in 1853.
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