Countess Caroline of Nassau-Saarbrücken
Countess Caroline of Nassau- Saarbrücken( 12 August 1704 – 25 March 1774) was Countess Palatine of Zweibrücken by marriage.
Countess Palatine Barbara of Zweibrücken-Neuburg
Countess Palatine Barbara of Zweibrücken-Neuburg (27 July 1559 – 5 March 1618) was a Countess Palatine of Zweibrücken by birth and by marriage Countess of Oettingen-Oettingen.
Countess Palatine Caroline of Zweibrücken
Caroline of the Palatinate-Zweibrücken (Henriette Caroline Christiane Louise; 9 March 1721 – 30 March 1774) was Landgravine of Hesse-Darmstadt by marriage to Louis IX, Landgrave of Hesse-Darmstadt.
She was famed as one of the most learned women of her time and known as The Great Landgräfin.
Louis IX, Landgrave of Hesse-Darmstadt
Louis IX of Hesse-Darmstadt  (15 December 1719 – 6 April 1790) was the Landgrave of Hesse-Darmstadt from 1768 - 1790.
He was a son of Louis VIII, Landgrave of Hesse-Darmstadt, and Charlotte of Hanau-Lichtenberg and Müntzenberg.
He was born in Darmstadt on 15 December 1719.
On 12 August 1741, Louis married Caroline of Zweibrücken, daughter of Christian III, Duke of Zweibrücken.
They had three sons and five daughters, including:
In 1775, Louis married Marie Adelaide of Cheirouze, countess of Lemberg.
On 6 April 1790 Louis died in Pirmasens.
Ogawa Mataji
Viscount was a general in the early Imperial Japanese Army.
He was also the father- in- law of Field Marshal Gen Sugiyama.
Countess Palatine Dorothea Catherine of Birkenfeld-Bischweiler
Countess Palatine Dorothea Catherine of Birkenfeld-Bischweiler (3 July 1634 – 7 December 1715) was a Countess Palatine of Zweibrücken-Birkenfeld-Bischweiler by birth and, by marriage, Countess of Nassau-Ottweiler.
Countess Palatine Maria Franziska of Sulzbach
Countess Palatine Maria Francisca of Sulzbach ("Maria Franziska, Pfalzgräfin von Sulzbach"; 15 June 1724 – 15 November 1794), was a Countess Palatine of Zweibrücken-Birkenfeld by marriage to Frederick Michael, Count Palatine of Zweibrücken-Birkenfeld.
Born in Schwetzingen, she was the fifth child of Joseph Karl, Count Palatine of Sulzbach and Countess Palatine Elizabeth Auguste Sophie of Neuburg.
From her six siblings, only she and two older sisters survive adulthood: Elisabeth Auguste and Maria Anna.
Elisabeth of Hesse, Countess Palatine of Zweibrücken
Elisabeth of Hesse (4 March 1503 – 4 January 1563, Lauingen) was a Landgravine of Hesse by birth and by marriage Countess Palatine of Zweibrücken and later Countess Palatine of Simmern.
Natalia Alexeievna (Wilhelmina Louisa of Hesse-Darmstadt)
Natalia Alexeievna, Tsarevna of Russia( 25 June 1755 – 26 April 1776), was the first wife of Paul Petrovich, Tsarevich of Russia( future Emperor Paul I), son of the Empress Catherine II.
She was born as Princess Wilhelmina Louisa of Hesse- Darmstadt as the fifth child of Louis IX, Landgrave of Hesse- Darmstadt and his spouse Countess Palatine Caroline of 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.

Question: Who is the father-in-law of Countess Palatine Caroline Of Zweibrücken?