Philippe, Duke of Anjou
Philippe of France, Duke of Anjou( 30 August 1730 – 7 April 1733) was a French prince and the second son of king Louis XV of France and Marie Leszczyńska.
He was styled Duke of Anjou from birth.
Francis III, Duke of Brittany
Francis III( 28 February 1518, in Amboise – 10 August 1536) was Duke of Brittany and Dauphin of Viennois.
He was the first son of King Francis I of France and Duchess Claude of Brittany.
Marie Émilie de Joly de Choin
Marie Émilie Thérèse de Joly, "Mademoiselle de Choin" (2 August 1670 – 1732) was a French lady-in-waiting, the lover and later the morganatic spouse of Louis, Dauphin of France.
As a morganatic spouse, she was not styled Dauphine of France.
Louis, Duke of Burgundy
Louis, Duke of Burgundy and later Dauphin of France( 16 August 1682 – 18 February 1712) was the eldest son of Louis, Grand Dauphin, and father of Louis XV, and briefly heir- apparent to the throne from his father's death in April 1711 to his own death 10 months later.
Until he became the official Dauphin of France upon his father's death in 1711, he was known as Le Petit Dauphin to distinguish him from his father, who was known as" le Grand Dauphin".
Louis, Duke of Brittany (1707–1712)
Louis, Duke of Brittany (8 January 1707 – 8 March 1712), was the second son of Louis of France, Duke of Burgundy, and Marie Adélaïde of Savoy.
Eldest surviving son of the Dauphin, he was a "fils de France".
Louis was born at Versailles to the Duke and Duchess of Burgundy.
He was created the Duke of Brittany succeeding his late brother Louis, who was the first to hold the title in 200 years.
At the time of his birth, Louis was the third-in-line to the throne and heir to his great-grandfather, King Louis XIV, following his father and grandfather, Louis, le Grand Dauphin.
He was preceded in birth by an elder brother, also named Louis, who was born in 1704 and died in infancy the following year.
Due to the deaths of his grandfather in 1711 and his father in 1712, he was heir apparent to his great-grandfather as Dauphin of France for three weeks in 1712.
Like his parents, he too died of measles and was buried in the Basilica of St Denis.
His younger brother became the Dauphin and eventually succeeded as King Louis XV in 1715.
Maria Teresa Rafaela of Spain
Maria Teresa Rafaela of Spain
( María Teresa Antonia Rafaela; 11 June 1726 – 22 July 1746) was an" Infanta of Spain" by birth and Dauphine of France by marriage to Louis, Dauphin of France, son of Louis XV of France.
She died aged 20, three days after giving birth to a daughter who died in 1748.
Charles Orlando, Dauphin of France
Charles Orlando, Dauphin of France( 11 October 1492 – 16 December 1495) was the eldest son and heir of Charles VIII of France and Anne of Brittany.
Louis, Dauphin of France (son of Louis XV)
Louis, Dauphin of France( 4 September 1729 – 20 December 1765) was the elder and only surviving son of King Louis XV of France and his wife, Queen Marie Leszczyńska.
He had a younger brother, Philippe, who died as a toddler.
As a son of the king, Louis was a" fils de France".
As heir apparent, he became Dauphin of France.
However, he died before ascending to the throne.
Three of his sons became kings of France: Louis XVI( reign: 1774–1792), Louis XVIII( reign: 1814–1815; 1815–1824) and Charles X( reign: 1824–1830).
Philippe Charles, Duke of Anjou
Philippe- Charles of France, Duke of Anjou( 5 August 1668 – 10 July 1671) was the fifth child and second son of Louis XIV, King of France and his wife, the Infanta Maria Teresa of Spain, and as such was a" Fils de France".
Marie Adélaïde of Savoy
Marie Adélaïde of Savoy, Princess of Savoy (6 December 1685 – 12 February 1712) was the wife of Louis, Dauphin of France, Duke of Burgundy.
She was the eldest daughter of Duke Victor Amadeus II of Savoy and of Anne Marie d'Orléans.
Her betrothal to the Duke of Burgundy in June 1696 was part of the Treaty of Turin, signed on 29 August 1696.
She was the mother of the future King Louis XV of France.
Styled as Duchess of Burgundy after her marriage, she became Dauphine of France upon the death of her father-in-law, Le Grand Dauphin, in 1711.
She died of measles in 1712, followed by her husband a week later.

Question: When did Louis, Duke Of Brittany (1707–1712)'s mother die?
Answer: 12 February 1712