Interesting tidbits.
Felix and Paul Warburg emigrated to the United States. Felix Warburg married Frieda Schiff, daughter of Jacob H. Schiff, a banker who grew up in Frankfurt. Schiff financed parts of the American rail system through his investment bank Kuhn Loeb. Schiff's great great grandson Drew married Al Gore's daughter Karenna.
https:// en.wikipedia.org/wiki/Warburg_family
https:// en.wikipedia.org/wiki/Jacob_Schiff
https:// en.wikipedia.org/wiki/Mortimer_L._Schiff
Deep hole here. More places to look. Prescott Bush, Harriman, Kuhn and Loeb. Around the time period of WWII.