Question: Who is the maternal grandmother of Joseph Alliluyev?
Sentence (from "Svetlana Alliluyeva"): Svetlana Iosifovna Alliluyeva (28 February 1926 – 22 November 2011), later known as Lana Peters, was the youngest child and only daughter of Soviet Premier Joseph Stalin and Nadezhda Alliluyeva, Stalin's second wife.
Relevant evidence: Yes