From Thomas Jefferson Encyclopedia
blah blah blah
Anna Scott Jefferson, (October 1, 1755 – July 8, 1828) was Thomas Jefferson's youngest sister (a twin to Randolph Jefferson) and married Hastings Marks in October 1787, according to Peter Jefferson's prayer book. Unfortunately there doesn't seem to be one single good source on Anna (or Anne, as she was also sometimes referred to). There is a note in our files on her that she and Hastings had one son, Valentine, who married a "Miss Brockenbough of 'Port Royal.' (this is according to a letter from Martha Jefferson Trist Burke to Jefferson Taylor, 1902). Anna (or Anne) Scott Marks (called "Aunt Marks" by TJ's children and grandchildren) came to live at Monticello with her brother after her husband's death in 1811; she died at Monticello in 1828, and is buried in the Monticello Graveyard.
Further Sources
