He was a son of surgeon Timothy Hosmer (born in Middletown, Connecticut, in 1740; died in Canandaigua, New York, in 1820). Timothy was a brother of Connecticut politician Titus Hosmer, and an officer in the Continental Army, serving throughout the American Revolutionary War, for two years and a half surgeon on Washington's staff. Timothy moved to Ontario County, New York, where his was one of the first two settlements in the wilderness. In 1798 he was appointed first judge of the county.
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