Looking for siblings/descendants of siblings - of:-
Jakob TREUMANN - birth date unknown - died Aug. 1934 in Schwetzingen, Germany.
1st wife, forename unknown but surname was Hirsh - one child born 1891 called Lutzi, Lutzi married a Pollack, family perished in WW2
2nd wife - Mathilde Hirsh (sister of 1st wife) - birth date unknown - died Dec 1925 in Konigsberg. Had 5 boys - born between 1894 and 1905 -Max, Walter, Erich, Kurt and Martin - only Martin survived WW2.
Max, Walter and Erich were born in Jutrosin, Poznan, Poland so perhaps the TREUMANN family originated from around that area, the other siblings were born in Germany.
3rd wife - Sophie nee Hess - died in the Shoah.
Have full details of children of the 3 wives, only looking for siblings/cousins of Jakob.
Any information gratefully appreciated.