But hear family moved to Austria to live for unknow reasons.
His family spoke polish, but lived in Russia.
Are you sure they were really Austria and Russia, not parts of Poland under Austrian and Russian occupation. For over a century before WWI Poland hadn't existed as an independent country.
He also spoke and wrote fluently Hebrew
Not Yiddish ? That's what Jews in Poland used.
SO, then, my family was originally from Silesia, Poland?
There's too little info to say anything.