Question: Who is the father-in-law of Princess Tuoba?
Sentence (from "Juqu Mujian"): By the time that Juqu Mujian succeeded his father Juqu Mengxun (Prince Wuxuan) in 433, Northern Liang appeared to be stronger than ever, yet was under the shadow of the much stronger state Northern Wei, to which Northern Liang was nominally a vassal.
Relevant evidence: Yes