The distance between brothers Harry and William continues to grow, and there are fears that unresolved tension could last for many years.
Prince Harry was seated two rows behind his brother at the King's coronation at the beginning of the month, reports the Mirror.
His attendance at the prestigious ceremony marked his first public appearance alongside his family since he criticised the Firm in his infamous memoir, Spare.
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The siblings barely uttered a word to one another during the ceremony, and Harry returned home to his wife Meghan and his two children just hours later.
Princess Anne was spotted turning towards a smiling Harry, and reportedly asking if he was comfortable with his seat three rows back.
According to lipreaders, Harry said: "I don't mind", before adding: "Sit at the front!"
An insider told the Mail on Sunday: "The Princess Royal has always had a soft spot for Harry and they both have a wicked sense of humour.
"People talk about Prince Andrew being the Spare but Anne was the second-born, too, and particularly since Diana died has always felt a duty to support her nephew.
"Both Anne and Harry have a great sense of humour and more in common than it might seem."
Previously, a friend of the royals suggested that Harry and Anne sit down together, noting that she was once in a similar position to him as the "spare".
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A source told the Telegraph: "She was second to [Charles] and kicked further down the line of succession as a woman, but she forged her own path.
"In her twenties she was bolshy and upset about a lot of things, but she came through that.
"He should talk to her about her experiences. She is shrewd, she could tell him a lot about what she went through."
And in an interview before the coronation, Anne appeared to make a small reference to her nephew as she discussed the prospect of a slimmed-down monarchy.
She told CBC: "Well, I think the ‘slimmed-down’ (monarchy) was said in a day when there were a few more people around to make that seem like a justifiable comment."
When she was told that the world does change, Anne added: "It changes a bit. I mean, it doesn’t sound like a good idea from where I’m standing, I have to say.
"I’m not quite sure what else, you know, we can do."
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