Question: What are some relatives of the people who fought in Operation Barbarossa?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/battle> <http://dbpedia.org/resource/Operation_Barbarossa> . ?x <http://dbpedia.org/ontology/relation> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}