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