Question: Which fictional character portrayed by Roger barton has Darth Vader as family member ?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri prop:family <http://dbpedia.org/resource/Darth_Vader> . ?uri prop:portrayer <http://dbpedia.org/resource/Roger_Barton_(film_editor)>  . ?uri rdf:type onto:FictionalCharacter}