Question: Who is the child of Wanyan Ningji's sister?
Paraphrase: Who is Wanyan Ningji's niece?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q16260511 wdt:P3373 ?X . ?X wdt:P22 ?answer}
Answer: Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin, Emperor Taizu of Jin