Infante Alfonso, Duke of Calabria
Infante Alfonso of Spain, Prince of the Two Sicilies, Duke of Calabria( 30 November 1901 – 3 February 1964) was one of two claimants to the title of the head of the House of Bourbon- Two Sicilies from 1960 until his death in 1964.
Alfonso was the son of Prince Carlos of Bourbon- Two Sicilies( 1870 – 1949) and his wife, Mercedes, Princess of Asturias( 1880 – 1904).
He was born and died in Madrid, Spain.
Alfonso's mother was Mercedes, Princess of Asturias, but she died in childbirth in 1904.
King Alfonso XIII of Spain was unmarried at the time so as the Princess of the Asturias' eldest son, Alfonso became heir- presumptive to the Spanish crown, though, unlike his mother, he never held the title of Prince of Asturias.
He was heir- presumptive until the birth of his cousin, Alfonso in 1907, to Alfonso XIII and Queen Victoria Eugenie.
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.
Leonor, Princess of Asturias
Leonor, Princess of Asturias( born 31 October 2005) is the heir presumptive to the throne of the Kingdom of Spain as the elder child of King Felipe VI and Queen Letizia.
In addition to the official title of Princess of Asturias, she bears the historical titles of Princess of Girona, Princess of Viana, Duchess of Montblanc, Countess of Cervera and Lady of Balaguer.
If Leonor ascended the throne, she would be Spain's first queen regnant since Isabella II, who reigned from 1833 to 1868.
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.
Prince Carlos of Bourbon-Two Sicilies
Don Carlos, Prince of Bourbon-Two Sicilies, Infante of Spain
(Full Italian name: "Carlo Maria Francesco d'Assisi Pasquale Ferdinando Antonio di Padova Francesco de Paola Alfonso Andrea Avelino Tancredi, Principe di Borbone delle
Due Sicilie, Infante di Spagna";
10 November 1870, , Bolzano, Austria-Hungary – 11 November 1949, Seville, Spain) was the son of Prince Alfonso of the Two Sicilies, Count of Caserta and his wife Princess Maria Antonietta of Bourbon-Two Sicilies, and nephew of the last King of the Two Sicilies, Francis II.
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.
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.
María de las Mercedes, Princess of Asturias
María de las Mercedes, Princess of Asturias (María de las Mercedes de Borbón y Habsburgo-Lorena) (11 September 1880 – 17 October 1904), was the eldest child of King Alfonso XII of Spain and his second wife, Maria Christina of Austria.
She was Princess of Asturias, the heir presumptive to the Crown of Spain, for all 24 years of her life.
Had her younger sibling, unborn at the death of Alfonso XII, been a daughter, Mercedes would have been Queen of Spain.
The sibling proved to be a boy, Alfonso XIII, and on his birth in 1886, Mercedes turned out not to be queen.
She resumed the position of heir presumptive, which she held until her own death, and was succeeded in it by her own infant son Alfonso, Alfonso XIII having not yet married and fathered a legitimate child.
Mercedes married in Madrid on 14 February 1901, her second cousin, Prince Carlos of Bourbon-Two Sicilies, a nephew of the King of the then-defunct Kingdom of the Two Sicilies, who was elevated to the rank of Infante of Spain.
The marriage was highly controversial due to her father-in-law's ties with the Carlists.
She died three years later from complication while giving birth to her third child.
Maria Teresa Felicitas d'Este
Maria Teresa Felicitas d'Este (October 6, 1726 – April 30, 1754) was born a princess of Modena and was by marriage the Duchess of Penthièvre.
She was the mother-in-law of Philippe Égalité and thus grandmother to the future Louis-Philippe of France.
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.

Question: Who is María De Las Mercedes, Princess Of Asturias's mother-in-law?
Answer: Princess Maria Antonietta of Bourbon-Two Sicilies