Question: Who is Empress Xiao (Sui Dynasty)'s father-in-law?
Sentence (from "Emperor Yang of Sui"): alternative name Ying (英), nickname Amo (阿摩), also known as Emperor Ming (明帝) during the brief reign of his grandson Yang Tong), was the second son of Emperor Wen of Sui, and the second emperor of China's Sui dynasty.
Relevant evidence: Yes