They go to schools where they are taught only in Yiddish and only about Jewish subjects.
Cohen speaks Hebrew rather than Yiddish—his grandmother lives in Haifa and his mother was born in Israel.
“Gutten himmel,” he replies, exclaiming “good heavens” in Yiddish.
1875, from Yiddish yidish, from Middle High German jüdisch "Jewish" (in phrase jüdisch deutsch "Jewish-German"), from jude "Jew," from Old High German judo, from Latin Judaeus (see Jew). The English word has been re-borrowed in German as jiddisch.