Question: Who is Empress Dowager Xiaozhuang's father-in-law?
Sentence (from "Empress Dowager Xiaozhuang"): Empress Xiaozhuangwen (28 March 1613 – 27 January 1688), of the Khorchin Mongol Borjigit clan, personal name Bumbutai, was a consort of Hong Taiji.
Relevant evidence: Yes