Harry went on: “I was brought into the world in case something happened to Willy; I was summoned to give backup, distraction, diversion, and, if required, a substitute part. Kidney, maybe. Blood transfusions. Speck of bone marrow. This was made plainly obvious to me from the beginning of my life’s journey and reaffirmed on a frequent basis after that.”
According to the line of succession, Prince William will succeed King Charles, following which Kate Middleton will become queen. After William, the crown will pass to Prince George, who will be succeeded in line by his siblings, Princess Charlotte and Prince Louis, as long as he does not have any offspring.
Prince William & Kate Middleton’s plan to avoid ‘Spare curese’ for Prince Louis
While Prince Harry enraged his brother and Kate Middleton with many of the allegations and comments made in his book and previous interviews, royal expert Jennie Bond believes that the Prince and Princess of Wales “must be acutely aware” of the problems that could arise from Prince Louis—and Princess Charlotte—being a “spare.”
“They have already shown that they have a different and modern attitude to bringing up royal children and I’m sure they will do everything to make Charlotte and Louis feel every bit as special, loved and valued as George,” Bond told the British newspaper.
“William & Kate don’t want history to repeat itself”

If he chooses to remain in the royal family, he will most certainly be assigned to a senior position within the monarchy, along with substantial titles.