Question: What are the names of the parents of the artist who had a concert tour called Summer Tour?
Answer(s):
answer: Harry Mendler
answer: Leah Mendler

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:music.artist.concert_tours ns:m.0vxdtdz . 
?c ns:people.person.parents ?x .
}