SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/nationality> <http://dbpedia.org/resource/United_States> . ?uri <http://dbpedia.org/ontology/relative> ?x . }
List all those whose relatives' nationality is United States.
SELECT DISTINCT ?e WHERE { ?z property:nationality resource:United_States . ?e property:relative ?z . }
answer
The people whose relatives have nationality from the United States are [answer].
People whose relatives are citizens of the United States are [the answer].