Prince Harry is concerned that one of Prince William and Kate Middletons children will find themselves in the role of the royal family spare, according to a candid new interview with The Telegraph .

Though William and I have talked about it once or twice, and he has made it very clear to me that his kids are not my responsibility, I still feel a responsibility knowing that out of those three children, at least one will end up like me, the spare, Harry said in the article, published Friday. And that hurts, that worries me.

As I know full well, within my family, if its not us ... its going to be someone else, the prince said.

In his new memoir, the Duke of Sussex writes extensively about the dynamic of heir versus spare, with the latter serving as the title of the bestselling book.

The royal says the shorthand was used by his father, mother and grandparents throughout his lifetime, writing that there was no judgement about it, but also no ambiguity.