However, what happens if you make a mistake with one of those rules?

There were more than a fewstartling revelations that came out of Harry’s memoir, “Spare.

Of course, this level of formality carried over to his sons, as well.

Prince Harry smiling with microphone

He accidentally texted the prince using the greeting, “Hello, mate.”

He was quickly taken aback by his own mistake, but the text message had already been sent.

He immediately sent another message, saying, “So sorry, just called you mate.

Prince Harry laughing

I didn’t mean to.”

This didn’t stop at the use of his title.

“To this day, Harry doesn’t like wearing a tie.”

Prince Harry and Prince William