Grosvernor was born in Pomfret, Connecticut. He was the uncle of Charles Grosvenor Bond. In 1838, Grosvenor moved with his parents to southeastern Ohio, where he attended school in Athens County. He later taught school before studying law. He was admitted to the bar in 1857 and practiced in Athens. Presidential elector for Grant/Wilson in 1872. Presidential elector for Garfiled/Arthur in 1880. Grosvenor married Samantha Stewart of Athens County, December 1, 1858. She died in 1866, leaving a daughter. He married Louise A. Currier, also of Athens County, May 21, 1867. She had two daughters.