Question: Who is the father of Edith Vonnegut and is also a writer?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/child> <http://dbpedia.org/resource/Edith_Vonnegut>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Writer>}