When Robert Henry Langworthy was born on 14 March 1785, in Hopkinton, Washington, Rhode Island, United States, his father, Samuel Langworthy, was 39 and his mother, Mercy Saunders, was 32. He married Lois Sisson in 1810. They were the parents of at least 2 sons and 4 daughters. He died on 21 February 1865, in Hopkinton, Washington, Rhode Island, United States, at the age of 79, and was buried in Hopkinton, Washington, Rhode Island, United States.