Except in the case of the Wessex a letter patent was issued before their marriage, that Edward would be an Earl not a Duke, and that their children would be named as children of an Earl.
See section that deals with The children of the Earl of Wessex
https://www.heraldica.org/topics/britain/prince_highness.htm#Wessex
So right now the Sussex children have the HRH titles. If their grandfather wants to take those title away, he will probably need to put out a letter patent.
But that link specifically says that LPs were not issued, that the Sovereigns Will in this matter was all that was necessary. That that will can be LPs, statements, press releases, verbal agreements etc.
At the time, many people have expressed the notion that a press release was not sufficient to modify the Letters Patent of 1917, and that Louise could not be deprived of her "rights" without letters patent. The fact is that royal styles and titles are a matter of royal prerogative, that does not require the advice of the government (the Letters Patent of 1917 were issued without any such advice). The sovereign's will and pleasure is all that matters, and she can change styles and titles as she pleases (see the documents concerning the style of the Duke of Windsor's wife and issue, in particular the view of the Law Officers that "the right to use this style or title, in our view, is within the prerogative of His Majesty and he has the power to regulate it by Letters Patent generally or in particular circumstances", their view of the "undoubted powers of the Sovereign from time to time to determine the ambit within which the style and title of Royal Highness should be enjoyed", and the opinion of Sir Geoffrey Ellis that "precedence not regulated by law is substantially that granted at Court and this is a question for the Crown"). How that pleasure is publicized, by letters patent, warrant, press release or verbal declaration, is immaterial.
The mention of LPs there concerns William's children.
The Queen has been pleased by Letters Patent under the Great Seal of the Realm dated 31 December 2012 to declare that all the children of the eldest son of The Prince of Wales should have and enjoy the style, title and attribute of Royal Highness with the titular dignity of Prince or Princess prefixed to their Christian names or with such other titles of honour.
Indeed, as has been frequently discussed Sophie herself said a couple of years ago that her children would be able to decide for themselves on their 18th birthdays. It was a big surprise at the time. Which if true suggests that HMTQ was at least open to the idea at one point, unlikely as it was to happen. All that was released about future children at the time of their marriage was the press release.
As it is Heraldica suggests that all Charles needs to do is to keep referring to the Sussex littles as Master and Miss and it is so. Unless I'm missing something?
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