Christian III, Count Palatine of Zweibrücken
Christian III, Count Palatine of Zweibrücken-Birkenfeld (Strassburg, 7 November 1674 – Zweibrücken, 3 February 1735) was a German nobleman.
He was a member of the House of Palatinate-Zweibrücken-Birkenfeld, a cadet branch of the House of Wittelsbach.
He was the son of Christian II of Zweibrücken-Birkenfeld and Katharina Agathe, Countess of Rappoltstein.
He was Count Palatine of Zweibrücken-Birkenfeld from 1717 to 1731.
In 1731, he inherited the sovereign duchy of Palatinate-Zweibrücken and thus became Count Palatine and Duke of Zweibrücken.
He was also Count of Rappoltstein from 1699 until his death.
Louis II, Count Palatine of Zweibrücken
Louis II of Zweibrücken  (14 September 1502 – 3 December 1532) was Count Palatine and Duke of Zweibrücken from 1514 to 1532.
He was the son of Alexander, Count Palatine of Zweibrücken and his wife Margarete of Hohenlohe-Neuenstein.
He was married in 1525 to Elisabeth of Hesse, daughter of William I, Landgrave of Lower Hesse, and they had two children.
His son Wolfgang inherited the title and his daughter Christine died young in 1534.
Louis II was buried in the Alexanderskirche in Zweibrücken.
Christian IV, Count Palatine of Zweibrücken
Christian IV, Count Palatine of Zweibrücken-Birkenfeld (6 September 1722 in Bischweiler – 5 November 1775 in Herschweiler-Pettersheim) was Duke of Zweibrücken from 1735 to 1775.
John I, 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.
He died in Germersheim in 1604 and was buried in the Alexanderkirche in Zweibrücken.
Countess Palatine Magdalene Catherine of Zweibrücken
Magdalena Catherine, Countess Palatine of Zweibrücken( 26 April 1607, Zweibrücken – 20 January 1648, Strasbourg) was a Countess Palatine of Zweibrücken by birth and by marriage Duchess and Countess Palatine of Birkenfeld.
John, Count Palatine of Gelnhausen
John, Count Palatine of Gelnhausen( 24 May 1698 in Gelnhausen – 10 February 1780 in Mannheim) was Count Palatine and Duke of Zweibrücken- Birkenfeld at Gelnhausen.
Kaspar, Count Palatine of Zweibrücken
Kaspar, Count Palatine of Zweibrücken and Veldenz( 11 July 1459 – c. Summer 1527) was Duke of Zweibrücken from 1489 to 1490.
Alexander, Count Palatine of Zweibrücken
Alexander of Zweibrücken  (26 November 1462 – 21 October 1514) was Count Palatine and Duke of Zweibrücken and of Veldenz in 1489–1514.
He was the son of Louis I, Count Palatine of Zweibrücken and his wife Johanna of Croÿ.
Alexander promised to establish a church after the successful return from a crusade, and it was kept in 1489 with the building of the Alexanderskirche in Zweibrücken.
Count Palatine William of Gelnhausen
Count Palatine William of Birkenfeld- Gelnhausen( 4 January 1701 in Gelnhausen – 25 December 1760 in The Hague) was a titular Count Palatine of Zweibrücken- Birkenfeld and an Imperial Field Marshal.
Rudolph II, Count Palatine of Tübingen
Rudolph II, Count Palatine of Tübingen( died 1 November 1247) was Count Palatine of Tübingen and Vogt of Sindelfingen.
He was the younger son of Rudolph I and his wife Matilda of Gleiberg, heiress of Giessen.

Question: Who is the paternal grandfather of Louis Ii, Count Palatine Of Zweibrücken?
Answer: Louis I, Count Palatine of Zweibrücken