Don't ask me how it all began," Sara Imas quoted her father as saying every time she asked him where they were from.
Neither Sara nor Leiwi's Chinese wife know much about the first four decades of his life in Germany.
But a long scar on his thigh told the story of the end of Leiwi's time in Europe. He got it crossing a border fence between Germany and Poland in 1939, at the age of 43.