Jobson added: "Raising his voice on occasion, Harry would insist: 'What Meghan wants, she gets.'"
He further described Harry as "prone to volatility", adding that "like this mother, he tends to wear his heart on his sleeve."
The new Prince Charles biography also explores the royal's complex relationship with his sons and how both Prince Harry and Prince William take after Princess Diana.
Quoting a source close to the Palace, the biographer claims: "To this day, Charles admits he often finds it difficult to gauge either of his sons' occasionally unpredictable moods.
"In that aspect of their nature, both princes are very much like their mother."