When Mehitabel Hadley was born about 1721, in Lower Yonkers, Westchester, New York Colony, British Colonial America, her father, Joseph Hadley, was 31 and her mother, Rebecca Dyckman, was 27. She married Isaac Vermilyea in 1742, in Yonkers, Westchester, New York Colony, British Colonial America. They were the parents of at least 3 sons and 5 daughters. She died in Cortlandt, Westchester, New York, United States.