Question: What year did Ismail Samani's father die?
Paraphrase: What year did Ismail Samani's father pass on?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q862648 wdt:P22 ?X . ?X wdt:P570 ?answer}
Answer: 0864-01-01T00:00:00Z, 0865-01-01T00:00:00Z