Albrecht, Duke of Bavaria
Albrecht, Duke of Bavaria (Albrecht Luitpold Ferdinand Michael; 3 May 1905 – 8 July 1996) was the son of the last crown prince of Bavaria, Rupprecht, and his first wife, Duchess Marie Gabrielle in Bavaria.
He was the only child from that marriage that reached adulthood.
His paternal grandfather was Ludwig III of Bavaria, the last king of Bavaria, who was deposed in 1918.
Cornelia (mother of the Gracchi)
Cornelia( c. 190s – c. 115 BC) was the second daughter of Publius Cornelius Scipio Africanus, the hero of the Second Punic War, and Aemilia Paulla.
She is remembered as a prototypical example of a virtuous Roman woman.
She was the mother of the Gracchi brothers, and the mother- in- law of Scipio Aemilianus.
Maria Thins
Maria Thins( c. 1593 – 27 December 1680) was the mother- in- law of Johannes Vermeer and a member of the Gouda Thins family.
Ebba Eriksdotter Vasa
Ebba Eriksdotter Vasa (circa 1491 – 21 November 1549) was a Swedish noblewoman.
She was the mother of Queen Margaret Leijonhufvud and the second cousin and mother-in-law of King Gustav Vasa.
Baroness Gösta von dem Bussche-Haddenhausen
Baroness Gösta von dem Bussche- Haddenhausen( 26 January 1902 – 13 June 1996) was the mother of Prince Claus of the Netherlands, who was the Prince Consort of Queen Beatrix of the Netherlands, thus making her the mother- in- law of the former Dutch Queen.
She is also the paternal grandmother of King Willem- Alexander of the Netherlands, who is the current Dutch King.
Vera Miletić
Vera Miletić (Serbian Cyrillic: Вера Милетић; 8 March 1920 – 7 September 1944) was a Serbian student and soldier.
She was notable for being the mother of Mira Marković, posthumously making her the mother-in-law of Serbian president Slobodan Milošević.
Eldon Howard
Eldon Howard was a British screenwriter.
She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.
Priscilla Pointer
Priscilla Marie Pointer( born May 18, 1924) is an American stage, film and television character actress.
She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
Marian Shields Robinson
Marian Lois Robinson( née Shields; born July 29, 1937) is the mother of Michelle Obama, former First Lady of the United States, and Craig Robinson, a basketball executive, and the mother- in- law of former U.S. President Barack Obama.
Countess Maria Draskovich of Trakostjan
Countess Maria Draskovich von Trakostjan (8 March 190410 June 1969) was the first wife of Albrecht, Duke of Bavaria, head of the House of Wittelsbach and claimant to the abolished throne of the Kingdom of Bavaria from 1955 to 1969, as well as the Jacobite pretender to the English throne.
For Wittelsbach loyalists, she was the rightful Queen Consort of Bavaria from 1955 until her death, and for Jacobites, she was also the rightful Queen Consort of England, Scotland, Ireland and France during the same period.

Question: Who is the mother-in-law of Countess Maria Draskovich Of Trakostjan?
Answer: Duchess Marie Gabrielle in Bavaria