Who are the people on the photo?

Addition - 15 January 2015

By: Silvia Carolina Grünebaum

Berlin 1933

*Private Collection*
By: Redactie Joods Monument
With: Moritz Cohen, Klara Karoline Weijel-Cohen, Margarete Minchen Grünebaum-Cohen

Copyrights: All rights reserved

On the back of the photo is written Berlin 1933. Some people are known. Two are unknown and one is douptfull.
Who can help me identify the unknown persons.