original_query: Who was the family of the maternal grandfather of Vladimir Lenin in the Russian Empire?
query: Who was the family of the maternal grandfather of Vladimir Lenin in the Russian Empire?
answer: The family of Vladimir Lenin's maternal grandfather was the Blank family.  Moshko (Dmitry) Blank was his maternal great-grandfather, a Jewish vodka tavern keeper who converted to Christianity.  His sons, Abel (Dmitry) and Srul (Alexander) Blank, also converted and became medical doctors.  Alexander Blank's daughter Maria married Ilya Ulyanov, and their son was Vladimir Lenin.