Question: Who is Beatrix Of Berg's father-in-law?
Sentence (from "Beatrix of Berg"): Beatrix (Beatrice) of Berg (1364 in Burg on the Wupper–May 16, 1395 in Neustadt an der Weinstrasse) was the daughter of Duke William II of Berg and Electress of the Palatinate by marriage to Rupert I, Elector Palatine.
Relevant evidence: Yes