There is a problematic dispute within the French Royal Family about who is the rightful Dauphin (crown prince) of France.
Prince Jean claims that he is the rightful Dauphin. His father, the Count of Paris, disagrees and says his eldest son, Francis, is the Dauphin.
Francis’s Wikipedia page, however, states that Jean is Dauphin (without citation).
But, if you go to the Count of Paris’s page, it says that Francis is heir.
The blog of the Royal Family also recognises Francis as heir, placing him right below Henri VII, Comte de Paris (scroll to the bottom of the page).
The Fundamental Laws of Succession are clear: inalienability of the crown. The king cannot regulate or change the order of succession unless there is some force majeure, something that would supersede the laws of succession (something that threatens the survival of the state, for example).
Francis has a mental disability, but this alone does not supersede the laws of succession.
For this reason, HRH the Count of Paris declared that Prince Jean would be regent for King Francis upon the death of the Count of Paris.
Edit: The problem resulting from this should be obvious. If the Count of Paris were to die before Prince Francis, it means there will be a split not just between monarchists (those who support the House of Orleans and the illegitimate Spanish Bourbons) but also within the House of Orleans itself. We legitimists will proclaim Prince Francis as the de jure Francis III, while others will proclaim Jean as king.