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No, George V's Letters Patent (1917) limit the HRH to the following:
(1) The monarch's children
(2) The children of the monarch's sons
(3) The oldest son of the oldest son of the Prince of Wales [I goofed in my earlier post when I said this royal would have an HH]. The other grandchildren of the monarch's sons would not be HRH. They would have the style and dignity of children of a Duke (Lords and Ladies).
Before the birth of Prince George the Queen issued new Letters Patent granting the HRH to ALL of William's children. Otherwise George would be HRH Prince George but his siblings would be Lady Charlotte and Lord Louis (following #3 above).
Likewise, unless new Letters Patent are issued, Harry's children will be Lord and Ladies (his oldest son will also have the courtesy title of Earl of Dumbarton). Once Charles becomes King they will be entitled to the HRH as children of the monarch's son (#2 above).
I hope this makes sense!
My impression was that Frelinghighness meant grandchildren BY sons of the monarch instead of grandchildren OF sons of the monarch - as the examples given were about Beatrice and Eugenie vs Zara and Peter. And that is consistent with how it works as you explained in your post above.