Joseph Pemberton, son of Israel Pemberton, Jr., was a member of a prominent Philadelphia Quaker family. He was married in 1767 to Ann Galloway of Maryland.
“[Diary entry: 23 September 1774],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/01-03-02-0004-0017-0023. [Original source: The Diaries of George Washington, vol. 3, 1 January 1771–5 November 1781, ed. Donald Jackson. Charlottesville: University Press of Virginia, 1978, p. 279.]