I have information on Joseph Fiest - Barbara (Senger) Fiest descendants in detail. Karl Fiest was my grandfather, my mother was Barbara (Fiest) Fosti. Children of Joseph & Barbara were Karl, Valentine, Elizabeth AND there was another daughter name of Margarette that you are missing in your information. I see you posted June 1999, better late than never I suppose.
I am trying to trace Anna Senger (sister to Barbara) who married ? Roerich, they apparently lived in Ipswitch, South Dakota; but I can not find a trace of them so far; I have a copy of a picture of (possibly) the widowed daughter of Anna with her four children (photo originally from one Joseph Senger - currently in a Senger Family history book by Nick & Thakla Bosch).