Question: What are the names of the kids of the artist who had the "History World Tour"?
Answer(s):
answer: Paris-Michael Katherine Jackson
answer: Michael Joseph Jackson, Jr.
answer: Prince Michael Jackson II

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.09x1nf . 
?c ns:people.person.children ?x .
}