The easiest records to check from Berlin are the Berlin Adressbuch, which can be viewed starting from
I think I found Boris KAPLON in the 1930 edition https://digital.zlb.de/viewer/image/34115495_1930/1503/
with occupation given as Buchdruckereibes[itzer]. (book printer owner) and living at 24 Motz strasse.
Ancestry also have this edition of the address book, as well as a phone book (where the surname is KAPLUN).
But you want to see the entire family...
In that case, you want the residents cards (Einwohnermeldekartei) for the family. These give a lot of information.
You get the names, date and place of birth, for every member of the household together with when they arrived and when they left each address they lived in.
These can be requested from the Landesarchiv Berlin. See:
It is all in German, but there is a link to an English language order form.
I hope this helps,