# Show US presidents and their children who attended the same school
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbr: <http://dbpedia.org/resource/>
PREFIX yago: <http://dbpedia.org/class/yago/>
SELECT DISTINCT ?president ?child  ?school WHERE
  {?president a yago:WikicatPresidentsOfTheUnitedStates,
                dbo:Person;
         dbo:child ?child;
         dbo:almaMater|dbp:almaMater|dbo:education|dbp:education ?school.
    ?child dbo:almaMater|dbp:almaMater|dbo:education|dbp:education ?school.
    FILTER (?school != ""@en) }