A royal insider  unveiled an adorable insight into  the dynamics of Prince William and Kate Middleton's marriage. 

The author of Gilded Youth: An Intimate History of Growing Up in the Royal Family, Tom Quinn, shared his heartfelt interaction with a source that worked closely with the pair.

"Kate treats him [William] like the fourth child because he's prone to tantrums,” revealed the insider.

Although Kate and William have the worst of fights, the former makes sure to keep them low-key.

"They do have rows. It's not a perfect marriage. They have terrific rows."

Quinn then continued, "But, where some couples have a row and throw heavy vases at each other, William and Kate throw cushions at each other. It's always kept under control."

"They very rarely complain and when they do it's always in measured terms," signed off the expert.