I didn’t see an email address for you, so I am posting my response here. My paternal great grandmother was Miriam Konigsberg (born 1856). Her father was Gabriel Konigsberg (born 1830) son of Nathan Konigsberg (born 1800) who was the son of Simon Konigsberg.
I am curious if you have gone further back with your uncle’s lineage and I wonder if your family intersects with my family. Both my father and I are in GEDMatch as A198550 and A870426.
My uncle, Mates KONIGSBERG was born in Tarnogrod, Poland 06/17/1902 to Shrage Fajwel and Meite
He moved to Danzig, then Berlin, then Amsterdam, then Barsingerhorn in Holland.
Sara VOGEL was born in Cieszanow (Czeszenow, Ciechanow, Cheszanow,) Poland on March 4, 2011 to Mordekhai and Yeta.
On June 12, 1936, Mates KONIGSBERG married Sara VOGEL in Holland.
On August 3, 1936 they arrived in Palestine on the ship “Galil”
I am at a brick wall. Except on the Yad Vashem website I found pages of testimony for Josef FOGEL from Cieszanow born 1905, Rachel WOGEL from Czeszenow born 1908 and Yitzkhak Dawid VOGEL from Ciechanow born 1914.
Yitzkhak Dawid and Josef were victims of the holocaust in the Netherlands.
The Pages of Testimony were submitted by their sister, Sara VISMAN
Sara, born in 1911 fits right in with Josef, Rachel and Yitzkhak. My father did say that Mates died young. I think Sara Vogel Konigsberg married Mr. Visman after my uncle died.
Any information on descendants of Mates KONIGSBERG, Sara VOGEL, Sara VISMAN would be greatly appreciated.