I can trace my family back to John Philip Mollenkopf (b.2/16/1821, d. April 1893).He married Dorothea Julian Heinlen (b. 6/1/1823, d. 9/24/1906) in 1843.
They came to the USA from Pfullingen, Germany in 1854.This is nearly a generation after John Jacob's arrival in the 1820's.Then, John Philip's family eventually settled into the same communities where John Jacob's family already resided.
John Philip had 3 brothers and 5 sisters - I have no knowledge of their names but suspect John Jacob Mollenkopf (b. 9/24/1794) must have been an older brother because one of John Philip's daughters is shown as Mary Margerate Witter (b.3/13/1861, d.6/6/1888).
John A. Mollenkopf (b.6/1/1835) may have been a younger brother to John Philip and John Jacob, if he was Mary's uncle.But, it seems unlikely a single mother would have borne children between 1794 and 1835 - she would have been in her late 50's by 1835.
Most of John Philip's children became farmers in Crawford County, Ohio - or moved to Lucas County, Ohio, where they helped dig the old canal (by hand) for 50 cents a day! Crawford County is adjacent to Wyandotte County, where my grandparents farmed.
Both of John Philip's parents died at about the age of 45 - leaving some of their 9 children as very young orphans.
I welcome any information you can provide, and will send more on my side of the family tree - which is pretty complete - if you are interested.