SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/child> <http://dbpedia.org/resource/Stevens_T._Mason> . ?x <http://dbpedia.org/ontology/deathCause> ?uri . }
What did Steven T Mason's father die from?
SELECT DISTINCT ?d WHERE { ?k property:death_cause ?d . . ?k property:child resource:Stevens_T._Mason }
Cholera
The cause of death of the person with child Stevens T. Mason is [Cholera].
The cause of death of the person and child named Stevens T. Mason is [cholera].