What is the {father} and the {mother} of {Janet_Jackson} ?
Who are Janet Jackson's parents?
Who is the father and mother of Janet Jackson?
SELECT ?j ?k WHERE { resource:Janet_Jackson property:mother ?k . resource:Janet_Jackson property:father ?j }
 SELECT ?ans_1 ?ans_2 WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131324> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P22> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_1. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131324> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P25> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_2. } 
SELECT ?ans_1 ?ans_2 WHERE { wd:Q131324 wdt:P22 ?ans_1 . wd:Q131324 wdt:P25 ?ans_2 }
Joe Jackson Katherine Jackson