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