Yes, there are. At an early screening of Harriet that was held in Cambridge, there were local descendants as well as those who lived all over the US.
I don't know. Alot of them ended up in Albany New York with her. I like Ms Frazier's suggestion of going through a genealogy website.
They may be...you may have to go through a genealogy website to find out. I'm quite sure her ancestors are around.
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