Her father, Thomas Ingersoll (1749–1812) married seventeen-year-old Elizabeth Dewey on 28 February 1775. Their first child, Laura, was born in Great Barrington in the colonial Province of Massachusetts Bay on 13 September 1775. Thomas's family had lived in Massachusetts for five generations. His paternal immigrant ancestor was Richard Ingersoll, who had arrived in Salem, Massachusetts, from Bedfordshire, England, in 1629. Thomas was born in 1749 in Westfield, Massachusetts. Elizabeth, daughter of Israel Dewey and his wife, was also born in Westfield, on 28 January 1758. Thomas moved to Great Barrington in 1774, where he settled into a house on a small piece of land by the Housatonic River. Over the next several years, his success as a hatmaker allowed him to marry, increase his landholdings, and expand his house as his family grew. He spent much time away from home, as he rose through the ranks in the military on the side of the American revolutionaries during the American Revolutionary War. Upon his return to Great Barrington, he was made a magistrate.