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He will still be Prince William.
If the father (Prince) does not hold another title, his children will be Prince or Princess. The off spring of that Prince will also be a Prince, but not so with the Princess - especially if she marries.
Prince Harry is not a king. His title is Prince Henry of Wales.
Harry's wife will become a princess and will take the major title of her husband, depending on what that is at the time For example, when Kate married William, she became a princess, but took on the title of 'Duchess of Cambridge' because the title of 'Duke of Cambridge' out-ranks your bog standard prince title. When Charles and Diana married, Diana took the title of 'Princess of Wales' because Charles was the Prince of Wales, which was a much bigger deal than just your normal 'run of the mill' prince.
Captain harry wales
It's Harry Potter and the Half-Blood Prince.
As a member of the royal family he inherited the title.
If he dies without children, Kate will be the dowager (whatever her former title was). And then Harry and his line will succeed to the throne. However, if William dies before he marries Kate, then Kate gets no title at all.
The same thing that happened to Elizabeth- she'll be in line to be Queen. She'll knock Harry from being 3rd in line to the throne. And then when she marries, her husband will take a title such as Duke of Edinburgh (a guy who marries into the family can't take a higher title than his wife, who is of royal blood. Therefore, he couldn't be King.).
It's Harry Potter and the Half-Blood Prince.
Harry Potter and the Half-Blood Prince.
His Royal Highness Prince Henry Charles Albert David of Wales