On the day of the Queen's death, Prince Harry said he received a "really horrible" reception from his family members.
In his interview with Tom Bradby on ITV, Harry said he hoped his grandmother's funeral would have brought the family together. But instead, Harry said there was a "really horrible reaction" with further "leaking and planting".
Speaking about the Queen's funeral: "The day that she died was just a really, really horrible reaction from my family members.
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"And then by all accounts, well certainly from what I saw and what other people probably experienced, was they were on the back foot and then the briefings and the leaking and the planting.
"I was like 'we're here to celebrate the life of granny and to mourn her loss, can we come together as a family?' but I don't know how we collectively, how we change that."
Elsewhere, the Duke of Sussex said it was "heartbreaking" that he "simply didn't believe" his brother when he said he wanted him to be happy and used the words "on mummy's life" at the Duke of Edinburgh's funeral.
In his book Spare, Harry described the phrase as a "universal password" or a "secret code" between the pair, which he said they had used for 25 years "for when one of us needed to be heard".
Harry told Mr Bradby: "It is heartbreaking. This whole thing is completely, not just unnecessary, it's incredibly sad. But there's a - there's a way through it, there's a way out of it.
"And that's what I'm focused on now. But yes, it's heartbreaking."
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