Sabina of Brandenburg-Ansbach
Sabina of Brandenburg-Ansbach (12 May 1529 – 2 November 1575) was a princess of Brandenburg-Ansbach and Electress of Brandenburg by marriage.
Elisabeth of Brandenburg-Küstrin
Elizabeth of Brandenburg- Küstrin( 29 August 1540 – 8 March 1578), was a princess of Brandenburg- Küstrin and margravine of Brandenburg- Ansbach and Brandenburg- Kulmbach by marriage.
Conrad, Margrave of Brandenburg-Stendal
Margrave Conrad I of Brandenburg (– 1304) was a member of the House of Ascania and a co-ruler of Brandenburg.
Catherine of Brandenburg-Küstrin
Catherine of Brandenburg- Küstrin( 10 August 1549 – 30 September 1602) was a Margravine of Brandenburg- Küstrin by birth and Electress of Brandenburg by marriage.
Magdalene of Brandenburg (1412–1454)
Magdalene of Brandenburg( born:; died: 27 October 1454 in Scharnebeck) was a princess of Brandenburg by birth and by marriage Duchess of Brunswick- Lüneburg.
John George, Elector of Brandenburg
John George of Brandenburg  (11 September 1525 – 8 January 1598) was a Prince-elector of the Margraviate of Brandenburg (1571–1598) and a Duke of Prussia.
A member of the House of Hohenzollern, he was the son of Joachim II Hector, Elector of Brandenburg, and his first wife Magdalena of Saxony.
Faced with large debts accumulated during the reign of his father, John George instituted a grain tax which drove part of the peasantry into dependence on a nobility that was exempt from taxation.
Though a staunch Lutheran opposed to the rise of Calvinism, he permitted the admission of Calvinist refugees from the wars in the Spanish Netherlands and France.
He was succeeded by his son Joachim Frederick.
Upon the death of his kinsman Albert I, Duke of Prussia in 1568, the Duchy of Prussia was inherited by the latter's underage son Albert Frederick.
John George's father was a co-inheritor of the Duchy of Prussia.
In 1577 the Brandenburg electors became co-regent with Duke Albert Frederick of Prussia.
Magdalene of Brandenburg
Magdalene of Brandenburg, also Magdalene and Magdalen, (7 January 1582 – 4 May 1616) was the daughter of John George, Elector of Brandenburg and his third wife Elisabeth of Anhalt-Zerbst.
She married Louis V, Landgrave of Hesse-Darmstadt.
Magdalena of Brandenburg, Countess of Hohenzollern
Magdalene of Brandenburg( 1460 in Tangermünde – 17 June 1496 at Hohenzollern Castle) was a German noblewoman.
She was a princess of Brandenburg by birth and by marriage a Duchess of Hohenzollern.
Sophie Magdalene of Brandenburg-Kulmbach
Sophie Magdalene of Brandenburg- Kulmbach( 28 November 1700 – 27 May 1770) was queen- consort of Denmark and Norway by marriage to King Christian VI of Denmark and Norway.
Herman, Margrave of Brandenburg-Salzwedel
Herman, Margrave of Brandenburg, also known as" Herman the Tall"( – 1 February 1308), a member of the House of Ascania, was Margrave and co-ruler of Brandenburg with his cousin Margrave Otto IV of Brandenburg- Stendal.

Question: Who is Magdalene Of Brandenburg's paternal grandfather?
Answer: Joachim II Hector, Elector of Brandenburg