They also had another son, William who was my grandfather. William married Minnie Ratieke and they are buried in the same cemetary in Northfield. I have a very old(about 15-20 years ago)listing of all the children of Freidrick and Augusta. I thinks there may be another one or two chldren to add to you list. Do you know when they came to this country? I also have a copy, though not a good one, of the Koeppen Coat of Arms that is stamped for authenticity.