Marie of Blois, Duchess of Anjou
Marie of Blois (1345-1404) was a daughter of Joanna, Duchess of Brittany and Charles, Duke of Brittany.
Through marriage to Louis I, Duke of Anjou, she became Duchess of Anjou, Countess of Maine, Duchess of Touraine, titular Queen of Naples and Jerusalem and Countess of Provence.
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.
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.
Louis I of Anjou
Louis I (23 July 1339 – 20 September 1384) was the second son of John II of France and Bonne of Bohemia.
Born at the Château de Vincennes, Louis was the first of the Angevin branch of the French royal house.
His father appointed him Count of Anjou and Count of Maine in 1356, and then raised him to the title Duke of Anjou in 1360 and Duke of Touraine in 1370.
In 1382, as the adopted son of Joanna I of Naples, he succeeded to the counties of Provence and Forcalquier.
He also inherited from her a claim to the kingdoms of Naples and Jerusalem.
He was already a veteran of the Hundred Years' War against the English when he led an army into Italy to claim his Neapolitan inheritance.
He died on the march and his claims and titles fell to his son and namesake, Louis II, who succeeded in ruling Naples for a time.
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.
Alix of France
Alix of France( July – August 1150 – 1197/1198) was countess consort of Blois by marriage to Theobald V, Count of Blois.
She was regent of Blois during the absence of her spouse in 1190- 1191, and regent during the minority of Louis I, Count of Blois from 1191 until 1197.
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.
Doria Ragland
Doria L. Ragland( born September 2, 1956) is the mother of Meghan, Duchess of Sussex, the mother- in- law of Prince Harry, and the maternal grandmother of Archie Mountbatten- Windsor, who is seventh in line to the British throne.
She is a former makeup artist, business owner, yoga instructor, and former social worker who worked in the mental health sector from 2015 to 2018.
Theobald III, Count of Blois
Theobald III of Blois( French:" Thibaut")( 1012–1089) was count of Blois, Meaux and Troyes.
He was son of Odo II, Count of Blois and Ermengarde of Auvergne.
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.

Question: Who is the mother-in-law of Marie Of Blois, Duchess Of Anjou?
Answer: Bonne of Bohemia