Prince Harry revealed Prince William’s four-word demand when responding to Meghan Markle pregnancy news

There was a time when Prince William and Prince Harry were close, and the youngest brother was clearly in a reflective mood when he penned his explosive memoir, Spare.

Harry has just been in the UK for a charity visit, donating a huge sum of his own money to Children in Need, before finding time to have afternoon tea with his father, King Charles.

Sadly, it seems a reunion with Prince William didn't take place thanks to his packed diary, and Donald Trump even seemed to take a dig at Harry during his speech at the state dinner last week.

Prince Harry and Meghan Markle now live over in the US with their two children, Archie and Lilibet.

While his relationship with William doesn't seem to be getting any better, Harry previously recalled a key moment between the two when he told his brother he was expecting his first child, Archie.

There was a time when William and Harry were much closer (Max Mumby/Indigo/Getty Images)

In his book Spare, Harry recalls what it was like when Meghan found out she was pregnant with Archie and how the couple couldn't wait to share the news with the Prince and Princess of Wales.

They decided to tell William and Kate when they were attending their cousin Princess Eugenie's wedding in October 2018.

He wrote: "Euge was getting married to Jack, and we were deliriously happy for her, and for ourselves, selfishly, since Jack was one of our favourite people."

Harry continued: "Meg and I were supposed to head off on our first official foreign tour as a married couple, but we delayed the departure several days, so we could be at the wedding."

"Also, the various gatherings connected to the wedding would give us a chance to pull aside family members one by one and tell them our good news," he explained of their logic.

He continued: "After the drinks reception, in St George's Hall, Meg and I pulled Willy aside."

Admitting it was something of a 'strange moment', Harry explained: "We were in a big room, suits of armour on the walls. Strange room, strange moment. We whispered the news, and Willy smiled and said 'we must tell Kate'."

Harry has recalled sharing the good news that Meghan was expecting (Gotham/GC Images)

"She was across the room, talking to Pippa, I said we could do it later, but he insisted.

"So we went and told Kate and she also gave a big smile and hearty congratulations. They both reacted exactly as I'd hoped," he revealed.

He also shared the time he told his father of their news, writing that he was 'delighted to learn that he was going to be a grandfather for a fourth time'.

Despite sharing such intimate moments between the family, Harry has insisted in a recent interview that his 'conscience is clear' after the release of the book.

Many have accused him of airing 'dirty laundy in public' but he insists it's not the case.

He told the Guardian: "I don't believe that I aired my dirty laundry in public, it was a difficult message, but I did it in the best way possible. My conscience is clear.

"I know that [speaking out] annoys some people and it goes against the narrative. The book? It was a series of corrections to stories already out there. One point of view had been put out and it needed to be corrected."