Louis, Duke of Brittany was the eldest son and the only infant son of Louis, Duke of Burgundy and Princess Marie Adélaïde of Savoy, grandson of Louis, Grand Dauphin, and great-grandson of Louis XIV. F
Fils de France
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Fils de France was the style and rank held by the sons of the kings and dauphins of France. A daughter was known as a fille de France.
Louis de France, called le Grand Dauphin, officially known at court as Monseigneur.
le Petit Dauphin, son of Monseigneur, le Grand Dauphin
Louis of France - Dauphin of Louis XV
Madame la Dauphine, wife of le Petit Dauphin