When Phebe Lawrence was born on 2 September 1762, in Lincoln, Middlesex, Massachusetts, United States, her father, William Lawrence, was 39 and her mother, Love Lucy Adams, was 37. She married Rev. Edmond Foster on 30 October 1783, in Lincoln, Middlesex, Massachusetts, United States. They were the parents of at least 7 sons and 6 daughters. She died on 14 July 1812, in Littleton, Middlesex, Massachusetts, United States, at the age of 49, and was buried in Old Burying Ground, Bedford, Middlesex, Massachusetts, United States.