Actually Betty Hemings sent Sally hemings to Paris as an opportunity to learn as well as be with her brother James and become a freed slave. In monticello they weren't free but in Paris they actually got paid for their services and wasn't considered slaves. James wanted to stay and only agreed to go back if Sally wanted to go and if Jefferson signed a paper allowing him to leave when he felt like it. Sally only came back because she was in love with Thomas Jefferson and was with child which her mother didn't approve her. Betty didn't want Sally to return to Monticello or impregnated by Jefferson. Although Jefferson did let James go with no question asked Sally was still considered a slave but a salve with benefits. Her children although Jefferson did give them freedom in his will it was actually unnecessary because two of his children left and the last two left before his will went into effect because of their pale skin and eye color they could pass as white so if he choose to free them or not it was irrelevant.