JOHNSTON -- Seeking info on parents, birthdate (1797?), and birthplace for Abraham T. JOHNSTON, millwright. Abraham married Margaret CROFT, daughter of David and Catherine (UNANGST) CROFT of Hamilton Twp., Franklin Co., PA. about 1818/19. Abraham & Margaret lived in Franklin Co. until about 1827, then they moved to Westmoreland Co., and settled in Ligonier Twp. Abraham died there about 1869. Abraham and Margaret had 9 children: Mary Ann (1820/21), Catherine (1823), David (1825), Elizabeth (1826), Margaret Jane (1829), Sarah (1832), Isaac (?), John (1836), Susannah (1839). I am descended from Mary Ann JOHNSTON (1820/21-1849), who married Francis COST (1814-1886), Coachmaker, died Indiana, PA.