I am looking for my family

I am the daughter of Meir-Manfred Apter (who is subscribed to aktuell ).
I am trying to find some information (and hopefully also pictures) about my father’s uncle, Yulek (or Yulik) Balsam (or Balzam), who was practicing boxing in a Berlin club (possibly Makkabi Berlin) before WW2, and was deported with his parents to one of the concentration camps in Poland.
I will appreciate any information, even if partial.

—
Gili Apter-Yehezkely
Chiffre 108319