I read through Quick Lesson 13 about evidence analysis, especially the case of Thomas Woodson, who some say was a son of Sally Hemings. I agree with the conclusion, based on Sally's year of birth and the lack of a son Tom in Jefferson's slave record. One thing I did not understand, though, was the assumption that if Tom Woodson was to be Sally Hemings' son, he had to be the child born in 1790. Could he simply have been missing from Madison's list? I know one would expect Madison to know who his siblings were, but he would also be expected to know if they survived childhood. Pretending that we don't yet know Sally's year of birth, and Tom's likely birth year from the census records, why wouldn't a birth year of around 1785 been used to estimate Tom's age at the birth of his son Lewis? That would then be the working theory until being ruled out by Sally being born in 1773.