He was born on Feb. 22, 1732 (Feb. 11, 1731, O.S.), the first son of Augustine Washington and his second wife, Mary Ball Washington, on the family estate (later known as Wakefield) in Westmoreland co., Va. Of a wealthy family, Washington embarked upon a career as a surveyor and in 1748 was invited to go with the party that was to survey Baron Fairfax's lands W of the Blue Ridge. In 1749 he was appointed to his first public office, surveyor of newly created Culpeper co., and through his half-brother Lawrence Washington he became interested in the Ohio Company, which had as its object the exploitation of Western lands. After Lawrence's death (1752), George inherited part of his estate and took over some of Lawrence's duties as adjutant of the colony. As district adjutant, which made (Dec., 1752) him Major Washington at the age of 20, he was charged with training the militia in the quarter assigned him.