Question: Of Marilyn Monroe's parents, whose date of death is March 11, 1984?
Answer(s):
answer: Martin Edward Mortensen

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04wqr)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04wqr ns:people.person.parents ?x .
?x ns:people.deceased_person.date_of_death ?num .
FILTER (?num < "1984-03-11"^^xsd:dateTime) . 
}