Earl Spencer, member of Diana, Princess of Wales, said helium misses his sister each time during an interrogation with the BBC.
"That's the happening with sibling loss, you ne'er get implicit it," helium told Laura Kuenssberg.
His book, Swan Song: Diana, My Sister, is owed to beryllium published connected Tuesday and is expected to beryllium highly captious of the Royal Family.
He said 1 of the reasons the publication is called Swan Song is due to the fact that it is his "sign off" arsenic Diana's member and "final instrumentality connected the situation".
"This is my swan opus too. I'm not present to bang connected astir Diana, this is my last word, solemnisation of her," helium added.
The afloat interview, Princess Diana: My Sister's Story, is disposable connected BBC iPlayer and volition beryllium broadcast connected BBC One astatine 18:30 BST connected Sunday.
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