Question: Who is Empress Duan (Huimin)'s father-in-law?
Sentence (from "Empress Duan (Huimin)"): Empress Duan (段皇后, personal name unknown) (died 400), formally Empress Huide (惠德皇后, literally 'the benevolent and virtuous empress'), was an empress of the Chinese/Xianbei state Later Yan.
Relevant evidence: No