Her father believed that he was the oldest son of Sally Hemings and President Thomas Jefferson; this tradition became part of the family's oral history. According to professional historians, this was not supported by known historical evidence. In 1998 DNA testing of descendants of the Jefferson, Hemings and Woodson male lines showed conclusively that there was no match between the Jefferson and Woodson lines; the Woodson male line did show western European paternal ancestry. According to historians at Monticello, no documents support the claim that Woodson was Hemings' first child, as he appeared to have been born before any known child of hers. Professional historians have ignored the erasure of the name of a male slave, who was born in 1790, whose named was recorded in Jefferson's "Farm Book" by Thomas Jefferson and the survival of at least one letter of the name of the mother of the son in the "Farm Book," as well. Thomas Woodson was born in 1790 and this time also matches the year of birth for the son named Tom attributed to Sally Hemings by newsman James Callender.