What is {relative} of {Ferdinand II of Aragon} that is {type of kinship} is {son-in-law} ?
Who is the son-in-law of Ferdinand II of Aragon?
Who is Ferdinand II of Aragon's son-in-law?
SELECT ?f WHERE { ?z property:kinship_to_subject resource:son-in-law . resource:Ferdinand_II_of_Aragon property:relative ?z . ?z property:relative ?f }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12860> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1038> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P1039> <http://wikidata.dbpedia.org/resource/Q3752578>
} 

SELECT ?obj WHERE { wd:Q12860 p:P1038 ?s . ?s ps:P1038 ?obj . ?s pq:P1039 wd:Q3752578 }