J. Conrad Geil and his son, Jacob Geil (b. 1746), came from
Germany to Philadelphia in1754, and settled in Chester Co. PA. The
descendants in this list are taken from "History of the Descendants of J.
Conrad Geil and his son Jacob Geil" by Joseph H. Wenger, South English,
Iowa, published at Elgin, IL 1914. It can be seen by ordering on
inter-library transfer from your local library.
He reports 6 generations, about 255 pages, and the list on this site is
only a portion from that book, plus records from family members.