Il est marié avec Mary Moore.
Ils se sont mariés septembre 1744 à Charleston, South Carolina, il avait 27 ans.
Enfant(s):
John of Georgetown (1717-1782), oldest son of John of Berkeley, settled along the lower Pee Dee River in Prince George's Parish just north of Georgetown. He is the John Postell who was a major in the Cherokee War of 1766. He married Mary Moore, daughter of Governor James Moore and Elizabeth Neufville
RIN: MH:N656