Question: Who is Margravine Magdalene Sibylle Of Brandenburg-Bayreuth's paternal grandfather?
Sentence (from "Frederick, Margrave of Brandenburg-Bayreuth"): He was the eldest son of Georg Frederick Karl, nominal Margrave of Brandenburg- Bayreuth- Kulmbach, by his wife Dorothea of Schleswig- Holstein- Sonderburg- Beck.
Relevant evidence: No