Question: Who is the paternal grandmother of Prince Wilhelm-Karl Of Prussia?
Sentence (from "Prince Oskar of Prussia"): Prince Oskar Karl Gustav Adolf of Prussia ("Oskar Karl Gustav Adolf Prinz von Preußen"; 27 July 1888 – 27 January 1958) was the fifth son of Wilhelm II, German Emperor and Augusta Victoria of Schleswig-Holstein-Sonderburg-Augustenburg.
Relevant evidence: Yes