Genealogy / Szymon (simon) Moshe Apfelbaum: Searching for Family in Tarnow [6]

I have posted before, but the sites suggested havent helped.

I am looking for information on my grandfather his name is Szymon (simon) Moshe Apfelbaum, he left Tarnow Poland before WW2 in Poland broke out. He left his Family and as we know it is the only survivour of his immediate family. He had 4 other siblings Herschel, Sara, Hanina and Chaya.

I wanted to know if anyone knows of what happened to his Family, how to find records of what happened to him and informaiton in Tarnow.

Thanks