After Thomas Dent died in 1676, his widow married Colonel John Addison and had a son, Thomas, by him. Although Rebecca Dent-Addison had children by her first husband, her remarriage appears to have caused a family rift and she deeded Gisbrough to Thomas alone. Col. Addison enlarged his estate by purchasing two adjacent tracts, "The Pasture" and "Pencott's Invention", from step-son Peter Dent in December 1686. The stream Oxon Run and its banks were patented to Addison in 1687, and named "Glennings". Addison then purchased an extensive new estate, Oxon Hill, in 1695.