Question: Who does the actor from Motown 25: Yesterday, Today, Forever call "Mom?"?
Answer(s):
answer: Katherine Jackson

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.film ns:m.05f5tq . 
?c ns:people.person.parents ?x .
?x ns:people.person.gender ns:m.02zsn .
}