Did {Pluto} {child astronomical body} {Charon}?
Does Pluto is a Charon?
Is Pluto a Charon?
ASK WHERE { resource:Pluto property:child_astronomical_body resource:Charon }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q339> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P398> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q6604>. } 
ASK WHERE { wd:Q339 wdt:P398 wd:Q6604 }