What is the date of birth and date of death of the child of Joseph Stalin, Vasily Dzhugashvili?
SELECT ?value1 ?value2 WHERE { wd:Q855 p:P40 ?s . ?s ps:P40 wd:Q459216 . ?s pq:P570 ?value1 . ?s pq:P569 ?value2 }
joseph stalin: Q855 vasily dzhugashvili: Q459216