I have been search of my Thompson line in Cambria co. It started in Indiana/Westmorland cos. I have a David Thompson, name only. I'll guess on the dates (1850's - 1930's). He had a son out of marriage, Robert Fredrick Thompson (d. 1974 Johnstown, PA). His mother was Rebecca (Ager) McCreery of the Derry area. Have you come across anything matching any of this?