Berlin, Germany records 1910s to 1930s? #germany #records

A. E. Jordan

If someone immigrated into Germany from the Ukraine circa 1915 and lived in or near Berlin till the early 1930s, what type of records exist?
They likely arrived with school age children. I do not believe anyone died in Berlin but instead they fled with the rise of the Nazis and stayed in Egypt till after World War II.
It would be very helpful to find any type of immigration records or something like a census listing to show the names of everyone in the family.
Ultimately I need to know the parents of the progenitor of the line to confirm that this is a missing branch of my family from the Ukriane.
The family name is KAPLUN. The oldest male is Boris and his wife Adele. 
Thank you for any assistance.
Allan Jordan

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