She is the reigning monarch on England and he is her grandson and set to take over the throne after his own father ascends to the top job. However, the knowledge that he has to take on the great responsibilities as a Future King has reportedly hurt the relationship between Prince William and Queen Elizabeth.

According to a recent report (via Express UK), as the queen ages and begins handing off more of her duties, it is increasing the workload her grandson, who is second in line for the throne, sees, and overall the relationship between them is significantly more serious than the one she has with her other grandchildren.

“Prince William is going to be king one day,” a source said. “The Queen is 93 and she’s offloading a lot of her work to both her son and to her grandson. William has really had to up the ante and take on a lot of this heavy lifting.”

Of course, this is nothing new when it comes to how it has affected the pair’s grandparent-grandchild relationship, which has had a partial business-like element to it since he was young after he was made aware of the job he would one day have. In fact, that particular reason, as well as the slightly more formal relationship he has with his father, is why Prince William and Kate Middleton reportedly have opted out of telling their eldest son, Prince George, who is his father’s heir, the truth about his future just yet also, giving him the chance at a more normal childhood first.

“It’s no secret that he and Charles have had a prickly relationship at times, “Royal Historian Robert Lacey said. “When William became a teenager, she would have him at Windsor Castle and would open the state boxes and guide him through the papers. It was William’s constitutional education.”

However, the increased duties could also be placing strain on the relationship because Prince William has not yet taken on the number of engagements in a year that both his grandmother and father have done. To date in 2019, Prince Charles has completed 131 engagements while the Queen has done 122. By comparison, Prince William has only completed 66.

Queen Elizabeth II and Prince William
Prince William and Queen Elizabeth II chat in the Royal Box at the Royal Albert Hall during the Annual Festival of Remembrance on Nov. 7, 2015, in London. Getty Images/Chris Jackson