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.
Maria Clementina Sobieska
Maria Clementina Sobieska (18 July 1702 – 18 January 1735) was a Titular Queen consort of England by marriage to James Francis Edward Stuart, a Jacobite claimant to the British throne.
The granddaughter of the Polish king John III Sobieski
, she was the mother of Charles Edward Stuart and of Cardinal Henry Benedict Stuart.
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.
James Francis Edward Stuart
James Francis Edward Stuart (10 June 1688 – 1 January 1766), nicknamed The Old Pretender, was the son of King James II and VII of England, Scotland and Ireland, and his second wife, Mary of Modena.
He was Prince of Wales from July 1688 until, just months after his birth, his Catholic father was deposed and exiled in the Glorious Revolution of 1688.
James II's Protestant elder daughter, Mary II, and her husband, William III, became co-monarchs and the Bill of Rights 1689 and Act of Settlement 1701 excluded Catholics from the English then, subsequently, British throne.
James Francis Edward was raised in Continental Europe.
After his father's death in 1701, he claimed the English, Scottish and Irish crown as James III of England and Ireland and James VIII of Scotland, with the support of his Jacobite followers and his cousin Louis XIV of France.
Fourteen years later, he unsuccessfully attempted to gain the throne in Britain during the Jacobite rising of 1715.
Following his death in 1766, his elder son, Charles Edward Stuart, continued to claim the British crown as part of the Jacobite Succession.
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.
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.
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.
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.

Question: Who is the mother-in-law of Maria Clementina Sobieska?
Answer: Mary of Modena