Question: Who were the parents of the subject of the movie "The Boy King"?
Answer(s):
answer: Alberta Williams King
answer: Martin Luther King, Sr.

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:film.film_subject.films ns:m.05v2mb5 . 
?c ns:people.person.parents ?x .
}