He was the only son of John Dunkin by his wife Anne, daughter of William Chapman, civil engineer, was born at Islington, London, on 9 August 1812.
In 1807, he married Anne, the daughter of William Chapman of Lincolnshire, a well-known civil engineer, by whom he left issue a son, Alfred John Dunkin, and a daughter, Ellen Elizabeth Dunkin.
In fact, the day after her divorce from Lee Agnew, Sr., in 1906, she married William Henry Chapman, who was then in his early seventies.
Bill G. Chapman (1928–2007), American advocate for visually impaired persons
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