What is {child} of {Abigail Adams} and {date of death}
When did Abigail Adam's child die?
What is Abigail Adams child's deathdate?
SELECT ?n ?a WHERE { ?y property:child ?a . resource:Abigail_Adams property:child ?y . ?y property:date_of_death ?n . }
select distinct ?dataprop1 ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q206191> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P40> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?statement <http://www.wikidata.org/entity/P580> ?dataprop1 . } 
SELECT ?value1 ?obj WHERE { wd:Q206191 p:P40 ?s . ?s ps:P40 ?obj . ?s pq:P570 ?value1 . }