Did {George_Washington} {mother} {Mary Ball Washington}?
Is George Washington the son of Mary Ball Washington?
Is Mary Ball Washington mother of George Washington?
ASK WHERE { resource:George_Washington property:mother resource:Mary_Ball_Washington }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P25> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q458119>. } 
ASK WHERE { wd:Q23 wdt:P25 wd:Q458119 }