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.
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.
Margarete Weißkirchner
Margarete Weißkirchner (1460-1500), was the common-law-spouse of Philip I, Count of Hanau-Münzenberg from 1477 until their death in 1500.
They openly lived together after the death of Philip's spouse in 1477.
They could not marry, because she was a commoner.
Margaret was not considered Philip's royal mistress, but was treated as if though they were married.
He appeared with her in public.
The most representative testimony is probably the first large-scale double-portrait in art history, the so-called "Gotha Lovers".
Their relationship is exceptionally well documented.
The couple had three children:
These children could not inherit the county, because they did not belong to the high nobility.
Nevertheless, Philip and Margareta included them in their will.
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.
Philipp I, Count of Hanau-Münzenberg
Count Philipp I of Hanau-Münzenberg, nicknamed "Philipp the Younger", (20 September 1449, at Windecken Castle – 26 August 1500)
was a son of Count Reinhard III of Hanau and Countess Palatine Margaret of Mosbach.
He was the Count of Hanau from 1452 to 1458.
The county was then divided between him and his uncle
Philipp the Elder.
Philipp the Younger
received Hanau-Münzenberg and ruled there from 1458 until his death.
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.
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.
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.
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 Margarete Weißkirchner?
Answer: Countess Palatine Margaret of Mosbach