Prince Charles and Prince Andrew’s already strained relationship got even worse after the latter did one thing to his older brother.

In his biography, royal author Tom Bower said that the Duke and Duchess of Cornwall became concerned with how the Duke of York spread poison about them and their relationship to Her Majesty.

Prince Andrew’s questionable behavior started while Prince Charles and Camilla were still dating. Instead of helping the royal couple earn Queen Elizabeth II’s approval, he didn’t do anything for them.

Sarah Ferguson’s ex-husband was accused of not supporting Prince Charles and Camilla’s relationship. And this resulted in the future King thinking that Prince Andrew was jealous of him and that he also wanted to be just like him.

“Camilla has always felt Andrew could have done more. The Queen listens to Andrew and he could have helped his brother at a time when he had few allies within the family… In fact, I would go so far as to say he was deeply unhelpful when support would have meant a huge amount to her and the Prince… Looking back to when there was little public sympathy for Charles and Camilla, if not open hostility, it was a case of Andrew playing politics. Camilla hasn’t forgotten,” Bower said.

But Prince Andrew’s dislike of Prince Charles and Camilla’s relationship shouldn’t have come as a surprise to the royal couple. The heir to the throne wasn’t also fond of Ferguson. In fact, Prince William and Prince Harry’s dad didn’t want the Duchess of York to attend his son’s royal wedding.

However, it was the Duke of Sussex’s decision that ruled at that time. After all, it was his wedding and he and Meghan Markle had a say on who they want to be there.

But when Prince William and Kate Middleton tied the knot, the royal couple didn’t invite Ferguson to attend their nuptials. Prince Andrew, Princess Beatrice, and Princess Eugenie were all there.

Prince Andrew, Prince Charles
Prince Charles always thought that Prince Andrew wanted to be like him. Pictured: Princes Andrew, Charles attend the Order of the Garter Service at St George's Chapel in Windsor Castle on June 15, 2015 in Windsor, England. Getty Images/Peter Nicholls-WPA Pool