When is the date and birth of Joseph Stalin's child with Svetlana Alliluyeva?
SELECT ?value1 ?value2 WHERE { wd:Q855 p:P40 ?s . ?s ps:P40 wd:Q228584 . ?s pq:P570 ?value1 . ?s pq:P569 ?value2 }
joseph stalin: Q855 svetlana alliluyeva: Q228584