SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/youthclubs> <http://dbpedia.org/resource/FC_Barcelona> . }
Name whose youth club was FC Barcelona?
SELECT DISTINCT ?s WHERE { ?s property:youthclubs resource:F_C_Barcelona . }
answer
The people with FC Barcelona as a youth club are [answer].
[answer]'s youth club was FC Barcelona.