Question: Who were the actors that played the character Square Dance Extra's parents?
Answer(s):
answer: Martin Edward Mortensen
answer: Gladys Pearl Baker

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.actor.film ?k .
?k ns:film.performance.character ns:m.0y4jrn_ . 
?c ns:people.person.parents ?x .
}