Did {Salman_Khan} {sibling} {Sohail Khan}?
Are Sohail Khan and Salman Khan siblings?
Is Sohail Khan the sibling of Salman Khan?
ASK WHERE { resource:Salman_Rashid_Khan property:sibling resource:Sohail_Khan }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q9543> . ?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/Q983053>. } 
ASK WHERE { wd:Q9543 wdt:P3373 wd:Q983053 }