Question: What is the fictional character which has Clan McDuck and Ludwig Von Draken as relatives?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/property/relatives> <http://dbpedia.org/resource/Clan_McDuck> . ?uri <http://dbpedia.org/property/relatives> <http://dbpedia.org/resource/Ludwig_Von_Drake> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/FictionalCharacter>}