When Dyer Dayton Stanley Sr. was born on 27 March 1781, in Shaftsbury, Bennington, Vermont, United States, his father, John Standley Jr., was 30 and his mother, Mary Fuller, was 28. He married Amy Hawley on 11 November 1802, in Shaftsbury, Bennington, Vermont, United States. They were the parents of at least 2 sons and 3 daughters. He died on 5 April 1813, in Middlefield, Otsego, New York, United States, at the age of 32, and was buried in Middlefield Center, Middlefield, Otsego, New York, United States.