Mary was born in 1775.1 Mary's father was Josiah Biscoe and her mother was Mary Bond. Her paternal grandparents were Thomas Biscoe and Abigail Mason. She had a brother named Jonas. She was the older of the two children. She had three half-brothers and a half-sister, named Daniel, Thomas, Leonard and Grace. She died at the age of 1 in 1776.1