Royal expert Robert Jobson said Prince William was very jealous and even shocked at what Prince Harry managed to do.

Jobson writes that Harry is happiest around veterans from the armed forces veterans, with whom he can drop the prince act and be himself. In 2014, he started the Invictus Games, which have since become his "number one passion project." Jobson praised Harry's fundraising ability because he knows how much is involved in financing the staging of the Games. Some say the Games caused jealousy in William.

Jobson said, "I think there was a degree of jealousy about how well it had gone. I do think that William was surprised at how much this had been a success, how much money was being thrown into it, and how many governments were getting involved."

The Mirror has asked Kensington Palace for a response to these comments.

The documentary is titled "Prince Harry's Mission: Life, Family, and the Invictus Games" and is available now on Hulu. It features Harry speaking about his own family and the significance of the Invictus Games for him. The show zeroes in on an interview Harry did with ABC News in Canada earlier this year in advance of next year's event. Harry, 39, inked an £80 million five-year deal with Netflix, but it isn't clear if their decision to put the documentary on Hulu was sanctioned by Netflix.

He founded the Invictus Games, international sporting events for wounded, injured, and sick armed services members and veterans. His Netflix series, "Heart of Invictus," will show the nice work being done to make real changes in the lives of the wounded from the wars.