Hmm--well-educated people do make mistakes, of course. Here's a little background on his:
Thomas was five years old when he began his education under the family tutor at Tuckahoe. In 1752 the Jeffersons returned to Shadwell and again started work on a plantation home. Thomas, however, spent little time at Shadwell. Almost immediately he was sent to Northam in St. James Parish, Virginia, where he studied Latin with the Reverend William Douglas until 1757, when his father died. He was then sent to the school of the Reverend James Maury in Fredericksville Parish, Virginia, and spent two years studying Greek and Latin classics, history, literature, geography, and natural science.
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But my bet is on 1 or 3.