I have seen a reference to Opie land being purchased by a member of the Cox family. I do not have that info handy, pending an attempted recovery of info on a now defunct PC. In the meantime, the Cox family, which married with the Cralles, held land located on both sides of the Yeocomico River, in both Westmoreland and Northumberland Counties. By the 19th century, the Cox family and related Cralles also had land in Richmond County. Find the intersection of those three counties and you will find their land.