Originally Posted by
JoostvD
I have a friend with a similar situation, although he is not interested in dual citizenship. He lives in South Africa and both of his parents were born in Germany (Berlin) approximately during the first world war. His grandparents were all born in the Austro-Hungarian Empire. His parents left Germany as adults in 1939 and moved to South Africa.
If they were Jewish, and they left Germany during the Nazi period, then they (and their descendants) should come under the special provisions that apply to victims of Nazi persecution. I know several people who obtained German citizenship under those special provisions.