Question: Whose children are married to Fredric Joliot-Curie?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/spouse> <http://dbpedia.org/resource/Frédéric_Joliot-Curie> . ?uri <http://dbpedia.org/property/children> ?x  . }
Answer: The people whose children's spouse is Fredric Joliot-Curie are [Marie Curie, Pierre Curie].