Did {Paul_McCartney} {sibling} {Mike McGear}?
Is it true that Paul McCartney have a sibling named Mike McGear?
Did Paul McCartney have a sibling named Mike McGear?
ASK WHERE { resource:Paul_McCartney property:sibling resource:Mike_McGear }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2599> . ?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/Q556941>. } 
ASK WHERE { wd:Q2599 wdt:P3373 wd:Q556941 }