Question: What nationality is Sabiha Sultan's father?
Sentence (from "Mehmed VI"): Mehmed VI Vahideddin ("Meḥmed-i sâdisVahideddin", or), who is also known as "Şahbaba" (meaning "Emperor-father") among his relatives, (14 January 1861 – 16 May 1926) was the 36th and last Sultan of the Ottoman Empire, reigning from July 4, 1918 until November 1, 1922 when the Ottoman Empire dissolved after World War I and became the nation of the Republic of Turkey on October 29, 1923.
Relevant evidence: Yes