Question: Who is the father-in-law of Countess Palatine Elisabeth Auguste Sofie Of Neuburg?
Answer: Theodore Eustace

She was the Hereditary Princess of Sulzbach by marriage. Joseph Charles, Hereditary Prince of Sulzbach (German: "Joseph Karl"; Sulzbach, 2 November 1694 – Oggersheim, 18 July 1729) was the eldest son of Theodore Eustace, Count Palatine of Sulzbach.