It goes back a long way, my friend. From Wikipedia -
(Jacob) Schiff was born in 1847 in Frankfurt am Main, Germany, to Moses and Clara (née Niederhofheim) Schiff, members of a distinguished Ashkenazi Jewish rabbinical family that traced its lineage in Frankfurt back to 1370. His father, Moses Schiff, was a broker for the Rothschilds.[1]
What relation is Jacob Schiff to Adam Bennett Schiff, son of Edward Schiff?