There is an Andrew Mitchell listed in the New York City directory in 1790.He was a merchant located at 234 Queens Dock.This was lower Manhattan where all of the businesses and residences of that era were located.
I do not know if Andrew is descended from the Robert Mitchell line, arr. Long Island circa 1700.Several successive generations of Mitchells from this line lived on Long Island and some went to Manhattan and Dutchess County.
Can you tell me what names are in your Mitchell family bible?Did you buy it on ebay in 2004?The bible that was sold was referenced at the Thorne Mitchell bible with Mitchell names dating to the early 1700s.It also had 5 pages of handwritten genealogy inserted.
If you can give me more info, I will try to help.And I would appreciate help regarding the Mitchell family bible.