Question: Who is Magdalene Of Jülich-Cleves-Berg's father-in-law?
Answer: Wolfgang, Count Palatine of Zweibrücken

John I of Zweibrücken (known as the Lame; ; 8 May 1550 – 12 August 1604) was Count Palatine and Duke of Zweibrücken during 1569–1604. He was born in Meisenheim as the second son of Wolfgang, Count Palatine of Zweibrücken and his wife Anna of Hesse. In 1588 he changed the state religion from Lutheranism to Calvinism