Did {Louis_XVI_of_France} {sibling} {Louis XIV of France} and {Charles X of France} ?
Were Charles X of France and Louis XVI brothers?
Was Louis XVI the sibling of Charles X of France?
ASK WHERE { resource:Louis_XVI_of_France property:sibling resource:Charles_X_of_France . resource:Louis_XVI_of_France property:sibling resource:Louis_XIV_of_France }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7732> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3373> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q7742>. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7732> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3373> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q7758>. } 
ASK WHERE { wd:Q7732 wdt:P3373 wd:Q7742 . wd:Q7732 wdt:P3373 wd:Q7758 }