I saw your email address in a follow up and hope you dont mind me contacting you direct.
I am researching Kreins, Heupels and Doerrs from South Russia.My father in law is a Krein from Neudorf and his father Gustav married two Heupel sisters, Karoline and Mathilde. Karoline was born in 14 Sep 1902.She died after giving birth to two children.Her sister Mathilde born 13 Jun 1910, then married Gustav Krein and had 11 children.
Karoline and Mathildes father was Jacob Heupel born 14 Nov 1868 in Kassel.His wife was Dorothea Doerr born 12 July 1871 to Ludwig Doerr and Christine Schnabel.
Does this ring any bells?Let me know if we can exchange info.