Archduke Simeon of Austria
Archduke Simeon of Austria( Simeon Carl Eugen Joseph Leopold; born 29 June 1958 in Katana, South Kivu, Belgian Congo) is a member of the House of Habsburg- Lorraine.
He is the third- eldest child of Archduke Rudolf of Austria and his first wife, Countess Xenia Czernichev- Besobrasov.
Simeon is a paternal grandson of Charles I of Austria and Zita of Bourbon- Parma.
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.
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.
Countess Xenia Czernichev-Besobrasov
Countess Xenia Czernichev-Besobrasov (Chernysheva-Besobrasova ; 11 June 1929
Paris20 September 1968, Casteau, Belgium) was the first wife of Archduke Rudolf of Austria, the youngest son of the last reigning Emperor of Austria-Hungary, Charles I.
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.
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.
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.
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.
Archduke Rudolf of Austria (1919–2010)
Archduke Rudolf of Austria (5 September 1919 – 15 May 2010) was the sixth child and youngest son of Emperor Charles I of Austria and Zita of Bourbon-Parma.

Question: Who is Countess Xenia Czernichev-Besobrasov's mother-in-law?
Answer: Zita of Bourbon-Parma