First-time author Mr Kippax said his mother helped to write the book, which documents stories of paranormal activity at his home in Gleadless Townend, towards the end of her life.
“She was laid on the sofa, obviously struggling with her own demons, but she would give me a tricky word or phrase to help me,” he said.
She died with a rare form of breast cancer in May 2023, just months before the book was released in October that year.
He self-published the work on Amazon under a pseudonym, William C Grave, with all the money raised going to Cavendish, who had supported the family throughout his mother’s illness.
He initially expected he might make around £2,500 from its publication, but it cleared that target within its first 24 hours.
Since then, it has sold more than 9,500 copies worldwide, as well as over 1,500 audiobooks, raising over £30,000 for the charity.
He said his mother would be “over the moon” with their success.
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