The final title card claims that after the movie was finished the last members of the Rothschild family left Europe. However many members stayed, even in Germany. Theodor Rothschild was managing a orphan’s home and a Jewish School in Stuttgart, where he helped other Jews immigrating from Germany, before he was was transported to the concentration camp. Jacob Rothschild, who was born in 1936 and was 4 years old while the movie was done worked for his father Victor’s branch “Rothschild and Sons” in London until 1980.
https://www.youtube.com/watch?v=JXgLm6i2Mb0