Douglas was born Issur Danielovitch (Yiddish: איסר דניאלאָוויטש; Belarusian: Ісур Данілавіч) in Amsterdam, New York, the son of Bryna "Bertha" (née Sanglel; 1884–1958) and Herschel "Harry" Danielovitch (c. 1884–1950; citations regarding his exact year of birth differ). His parents were Jewish immigrants from Chavusy, Mogilev Region, in the Russian Empire (present-day Belarus)
> Douglas was born Issur Danielovitch (Yiddish: איסר דניאלאָוויטש; Belarusian: Ісур Данілавіч) in Amsterdam, New York, the son of Bryna "Bertha" (née Sanglel; 1884–1958) and Herschel "Harry" Danielovitch (c. 1884–1950; citations regarding his exact year of birth differ). His parents were Jewish immigrants from Chavusy, Mogilev Region, in the Russian Empire (present-day Belarus)
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