What is {sibling} of {Mary Shelley} that is {type of kinship} is {maternal half-sister} ?
What is the name of Mary Shelley's maternal half-sister?
Who is the maternal half-sister of Mary Shelley?
SELECT ?l WHERE { resource:Mary_Shelley property:sibling ?g . ?g property:sibling ?l . ?g property:kinship_to_subject resource:maternal_half-sister }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q47152> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3373> .
?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/Q19595229>
} 

SELECT ?obj WHERE { wd:Q47152 p:P3373 ?s . ?s ps:P3373 ?obj . ?s pq:P1039 wd:Q19595229 }