My Great great grandmother was Elizabeth McAllister she was married to Thomas Shay. They lived in Lebanon PA. I wonder if she is a brother to your William McAllister? I do not know any of my great great grandmothers siblings and I do not know who her parents were. THOMAS C. SHAY Born July 11, 1780 Cornwall, Lebanon, PA Died May 5, 1865 Cornwall, Lebanon, PA Spouse 1 Mary Engel Spouse 2 Elizabeth McAllaster (McAllister) Born Jan 1, 1800 Cole Brook, Lebanon, PA Died Mar 22, 1884 Harrisburg, Dauphin, PA