Nicholas I, Duke of Troppau
Nicholas I  (c. 1255 – 25 July 1318) was the natural son of Bohemian king Ottokar II Přemysl and his mistress Agnes of Kuenring.
In 1269 he became Duke of Opava (at modern day Opava, Czech Republic) and thereby the progenitor of the Silesian cadet branch of the Přemyslid dynasty that lasted until 1521.
He was legitimated by his father with the consent of Pope Urban IV and raised at the Prague court.
As his half-brother Wenceslaus II was designated to succeed his father on the Bohemian throne, Nicholas in compensation received Troppau, then a part of the Moravian march.
He supported his father in the 1278 Battle on the Marchfeld, was captured by Hungarian forces, but regained his duchy from the victorious German king Rudolph of Habsburg.
His rule was however challenged by Ottokar's widow Kunigunda Rostislavna, who had retired to Hradec nad Moravicí.
In 1283 Nicholas married King Rudolph's niece Adelheid.
They had three sons:
Nicholas retained the Duchy of Opava after the last Přemyslid ruler of Bohemia, King Wenceslaus III was killed in 1306.
The Bohemian Crown however passed to Duke Henry of Carinthia and Nicholas had to accept the pledge of his duchy in favour of the Silesian Piast duke Bolesław III the Generous of Legnica, the husband of King Wenceslaus' III sister Margaret.
King Henry's successor John of Luxembourg however redeemed the pawn and in 1318 re-installed Nicholas's son Nicholas II as duke.
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.
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.
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.
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.
Rudolph II, Count of Habsburg
Rudolph II( or Rudolph the Kind)( died 10 April 1232) was Count of Habsburg in the Aargau and a progenitor of the royal House of Habsburg.
He was the only son of Count Albert III of Habsburg and Ita of Pfullendorf.
He married Agnes of Staufen.
Rudolph was the father of Count Albert IV of Habsburg and Count Rudolph III of Habsburg and the grandfather of King Rudolph I of Germany.
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.
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.
Adelaide of Habsburg
Adelaide of Habsburg ("Justina") (died 1313) was niece of emperor
Rudolph I of Germany, but her parentage is uncertain.
In 1283 she married Nicholas I, Duke of Troppau.
This marriage was consecrated on 8 February 1285.
They had three sons:

Question: Who is Adelaide Of Habsburg's mother-in-law?
Answer: Agnes of Kuenring