Prince Harry has "resentment" to "calculated" William who he thinks "made him the spare", according to a royal expert.
The brothers are set to briefly reunite this week at Westminster Abbey on May 6 to help celebrate the King's Coronation.
But while Harry will be alone, as wife Meghan stays at home in Los Angeles to look after their two children, the brothers will have a chance to speak to each other for the first time in months.