Question: Who are the parents of the author of "Antony and Cleopatra"?
Answer(s):
answer: John Shakespeare
answer: Mary Shakespeare

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:theater.theatrical_lyricist.play_lyrics_written ns:m.0hb7d . 
?c ns:people.person.parents ?x .
}