Rebecca..what I have is that Mary Jefferson b Oct 1, 1741 in Abermarle Co VA married a John Blair Bolling b Jun 24 1737 Henrico Co; m Jan 29, 1760; d Apr 1800 Chesterfield Co.
This marriage produced quite a few children from what I have found, and some sources say one of these children was a Joseph Bolling b Abt 1773 Bedford Co, VA; d bef mar 6 1832. He married Rebecca Maddox b 1782. I have that they were married in 1796. I've not been able to document the fact that Mary Jefferson, Thos. Jefferson's sister indeed had a son by the name of Joseph, so that is what I am looking for at this point. I do plan a trip to VA this summer to do some research and this one is at the top of my list.
If you can share any info please let me know. Thank you