Source: The History of the Princes, the Lords Marcher, and the Ancient Nobility of Powys Fadog, and the Ancient Lords of Arwystli, Cedewen, and Meirionydd by J. Y. W. Lloyd, Vol. IV, London, 1884, pp. 179-180. "...John Roberts married here [in Pennsylvania] a few years after coming over, it is said, Elizabeth Owen, a niece of Owen Humphreys (ap Hugh), of Llwyn du, in Merionethshire, and it has been printed that he was then 60 years old, and the bride was only 16. His will, signed 18. 12mo. 1703-4, witnessed by James Thomas, Nathan Thomas and John Roberts, Jr., was proved at Philadelphia 18 March following. He names sons John and Matthew Roberts, and daughter Rebecca; nephews Robert, Joseph and Edward Roberts, brothers Edward and Matthew Roberts, and John Owen, his brother-in-law, to be executors, and appointed friends Thomas, John, and Benjamin Humphrey, and brother-in-law Joshua Owen,* overseers of his will."
John married Elizabeth Owen, daughter of Owen Humphrey of Llwyn du and Margaret Vaughan.