I know Marx was a Jew. However, the court historians claim Lenin and Stalin were not,  Lenin's mother was Jewish.  http://en.wikipedia.org/wiki/Blank_family     Alexander Blank married twice. His first wife was Anna Groschopf (Анна Ивановна Гроссхопф). They had one son, Dmitry, who committed suicide at the age of 19 because of a gambling debt[5] and five daughters: Anna, Lyubov, Yekaterina, Maria and Sofia[1]. Each of the five daughters married a school teacher and left five to ten children. The fourth daughter, Maria married Ilya Ulyanov and became mother of Vladimir Lenin[5].