I am descended from Samuel and Mary Taylor Alexander thru their son, Andrew.Andrew is a brother to Francis.
He was known as Francis ("Carroll's Delight") Alexander b. 1693, who married Jane Blair ca 1718 in Frederick Co., MD.As I recall, a descendant married another Blair and the two are often confused.
I show that a Martha Blair was m. to a Samuel Alexander b. 1717, m. about 1740 in New Castle, DE.Martha Blair b.ca 1708 in NC and Jane b. 1694 in Ireland.I show they were sisters.The line from Francis s/o Samuel and Mary Taylor Alexander, and Jane Blair, lead to Andrew Lamar Alexander, Jr., gov. of TN.I think there is another Blair in there somewhere.
Francis' brother, Andrew, m. Jane/Jean (McKnitt) Alexander, and their son, Benjamin, is my line.