Hi, he left Poland when he was about 20 for Germany and married my great-grandmother who was German. She was protestant and they had a few kids one being my grandmother. His last name was Grünbaum but on his headstone in hebrew it says "Son of Joseph Mair". It says his mothers name was a typical hebrew name. I actually did look at szukajwarchiwach.pl before and there's lots of Grünbaum's but I never found what i would think was the right one. Maybe i will try the other site.
and what kind of DNA test did you have? mitochondrial?
No, autosomal. But my mtDNA is v1a1