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.
Donna Harun
Donna Harun( born February 21, 1968) is an Indonesian actress and model of Dutch- Indonesian descent.
She is the mother of actor Ricky Harun and mother- in- law of the actress and model Herfiza Novianti.
Srinagarindra
Princess Srinagarindra (21 October 1900 – 18 July 1995)
née
Sangwan Talapat  was a member of the Thai Royal Family.
She was also a member of the House of Mahidol, which is descended from the Chakri Dynasty, and was originated by Prince Mahidol Adulyadej, the Prince of Songkla, son of King Chulalongkorn (Rama V).
She was the mother of Princess Galyani Vadhana, the Princess of Naradhiwas, King Ananda Mahidol (Rama VIII), and King Bhumibol Adulyadej (Rama IX).
Her given name was Sangwan , while her formal name and title were Somdet Phra Srinagarindra Boromarajajonani .
In Thailand, she was affectionately called Somdet Ya , "the Royal Grandmother".
By the various hill tribe people, to whom she was a special patron, she was called Mae Fah Luang , "Royal Mother from the Sky" or "The Heavenly Royal Mother".
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.
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.
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.
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.
Mahidol Adulyadej
Mahitala Dhibesra Adulyadej Vikrom, the Prince Father (1 January 1892 – 24 September 1929), formerly Mahidol Adulyadej, Prince of Songkla  or Mahidol Songkla, was the father of King Ananda Mahidol (Rama VIII) and King Bhumibol Adulyadej (Rama IX) of Thailand.
He was also regarded as the father of modern medicine and public health of Thailand.
He also founded the House of Mahidol or the present Royal Family of Thailand.
Prince Mahidol was the 69th child of King Chulalongkorn and the 7th of Queen Savang Vadhana.
His mother also adopted four other royal princes whose commoner mother (Chao Chom Manda) had died; among them was Prince Rangsit Prayulsak, later Prince of Chainat, who became a very close friend of Prince Mahidol during his childhood.
Later in their lives, Prince Rangsit would play a pivotal role in Mahidol's career, and would later be appointed regent to one of Mahidol's sons, Bhumibol.
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.

Question: Who is the mother-in-law of Srinagarindra?
Answer: Savang Vadhana