Lynne, I have corresponded with Brandi, too.She has good family info. My husband descends through Andrew & Sarah's son David Mackey (b. 1808 in Penn. according to 1850 census) who married Margaret Stanton.
I have Andrew as being born 1759 according to his tombstone in the Mackey Farm Cemetery in Monroe township.
Have you learned any more about Andrew & Sarah? Elaine