Question: When was Louis IX of France born, and when did was his son Blanche de France born?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q346 p:P40 ?s . ?s ps:P40 wd:Q14751950 . ?s pq:P569 ?value1 . ?s pq:P570 ?value2 }