Question: What language belonged to Western Siouan language family do the Lakota Indians speak?
Answer(s):
answer: Lakota Language

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0fk39)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0fk39 ns:people.ethnicity.languages_spoken ?x .
?x ns:language.human_language.language_family ns:m.03d93s . 
}