Question: Who is the father-in-law of Queen Hyosun?
Sentence (from "Crown Prince Hyojang"): hangul:효장세자 hanja:孝章世子, February 15, 1719 – November 16, 1728) was a Crown Prince and noble of Korean Joseon dynasty, first and illegitimate son of King Yeongjo of Joseon and adoptive father of King Jeongjo of Joseon, elder half-brother of Crown Prince Sado, but he died at a young age.
Relevant evidence: Yes