Question: Who is Margravine Magdalene Sibylle Of Brandenburg-Bayreuth's paternal grandfather?
Sentence (from "Margravine Magdalene Sibylle of Brandenburg-Bayreuth"): They had three children:
Magdalene Sibylle had a good relationship with the Swedish royal family (the Queen consort from 1620 to 1632, Maria Eleonora of Brandenburg, was her first cousin) and was able to save the city of Pirna from attack by a letter to the Swedish commander in 1639, during the Thirty Years' War.
Relevant evidence: No