Henry IV of England
Henry IV (15 April 1367 – 20 March 1413), also known as Henry Bolingbroke , was King of England from 1399 to 1413.
He asserted the claim of his grandfather King Edward III, a maternal grandson of Philip IV of France, to the Kingdom of France.
Henry was the son of John of Gaunt (the fourth son of Edward III) and Blanche of Lancaster.
John enjoyed a position of considerable influence during much of the reign of his nephew King Richard II, whom Henry eventually deposed.
Henry founded the Lancaster branch of the House of Plantagenet.
He was the first King of England since the Norman Conquest whose mother tongue was English rather than French.
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.
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.
Blanche of England
Blanche of England, LG( spring 1392 – 22 May 1409), also known as Blanche of Lancaster, was a member of the House of Lancaster, the daughter of King Henry IV of England by his first wife Mary de Bohun.
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.
Mary de Bohun
Mary de Bohun (c. 1369/70 – 4 June 1394) was the first wife of King Henry IV of England and the mother of King Henry V. Mary was never queen, as she died before her husband came to the throne.
Henry de Bohun
Sir Henry de Bohun( died 23 June 1314) was an English knight, the grandson of Humphrey de Bohun, 2nd Earl of Hereford.
He was killed on the first day of the Battle of Bannockburn by Robert the Bruce.
Riding in the vanguard of heavy cavalry, de Bohun caught sight of the Scottish king who was mounted on a small palfrey"( ane gay palfray Li till and joly)" armed only with a battle- axe.
De Bohun lowered his lance and charged, but Bruce stood his ground.
At the last moment Bruce manoeuvred his mount nimbly to one side, stood up in his stirrups and hit de Bohun so hard with his axe that he split his helmet and head in two.
Despite the great risk the King had taken, he merely expressed regret that he had broken the shaft of his favourite axe.
An iconic description and picture of the death of Henry de Bohun is contained in" Scotland's Story" by H. E. Marshall.
Eleanor de Bohun
Lady Eleanor de Bohun( – 3 October 1399) was the elder daughter and co-heiress with her sister, Mary de Bohun, of their father Humphrey de Bohun, 7th Earl of Hereford( 1341 – 1373).
Her mother was Lady Joan Fitzalan, daughter of Richard FitzAlan, 10th Earl of Arundel and his second wife Eleanor of Lancaster.
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 Mary De Bohun's mother-in-law?
Answer: Blanche of Lancaster