Joseph Dudley
Through his paternal grandparents, Ann Dudley (1684–1776) and John Winthrop, F.R.S. (1681–1747), he was a member of the Dudley–Winthrop family, a line that originates with Thomas Dudley—founder of Massachusetts and Winthrop's great-great-grandfather. His paternal great-grandfathers were Joseph Dudley (1647–1720) and Wait Still Winthrop (1641/2–1717).