Question: What sibling of Michael Jackson wrote the music for Poetic Justice?
Answer(s):
answer: Janet Jackson

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.09889g)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.09889g ns:people.person.sibling_s ?y .
?y ns:people.sibling_relationship.sibling ?x .
?x ns:film.music_contributor.film ns:m.06974q . 
}