Wikipedia Biographical Summary:

"...John Augustine Washington (1736–1787) was a member of the fifth Virginia Convention and a founding member of the Mississippi Land Company. During the American Revolution he was a member of Westmoreland County's Committee of Safety and the Chairman of the County Committee for Relief of Boston..."

"...He was the brother of President George Washington and the third son of Mary Ball and Augustine Washington. John Washington married Hannah Bushrod in 1756, and lived with her in the family estate, Mount Vernon. One of their children was Supreme Court Justice Bushrod Washington..."

SOURCE: Wikipedia contributors, 'John Augustine Washington', Wikipedia, The Free Encyclopedia, 23 November 2010, 22:15 UTC, <http://en.wikipedia.org/w/index.php?title=John_Augustine_Washington&oldid=398520664> [accessed 4 September 2011]