Robert McWilliams, b. Ireland was in Beaver Co. where his son Alex (1826 birth cert) was born. I think near New Castle, PA. Came from Chester Co. aft. 1810. Was in Mercer Co. by 1840. 1820 & 1830 not on cemsus. Ubers - Peter Johannes on down. Link on paternal & maternal lines. Zigler/Ziegler. Cynthia m. Samuel Lightner who died either 1881 or 1886 somewhere?