Queen Elizabeth II and Prince Philip blamed their son, Prince Charles, more for his divorce from Princess Diana.

The Queen and the Duke of Edinburgh didn’t interfere with the Prince and Princess of Wales’ marriage until their relationship was irrepairable that the monarch, herself, advised them to get a divorce.

However, according to Robert Lacey, Her Majesty and Prince Philip put more of the blame to their own son Prince Charles. He said that this was because he was already committed to Camilla Parker Bowles even before he married his first wife.

“[The queen] and her husband, Prince Philip, put more of the blame on Prince Charles,” Lacy said in the documentary “Princes Of The Palace.” “Prince Charles of course, as we since discovered, was already committed emotionally to another woman.”

In a letter addressed to Princess Diana, Prince Philip reportedly called the heir apparent “silly” for choosing the Duchess of Cornwall over the Princess of Wales. He admitted that they never thought Prince Charles would leave the mother of her two sons for divorcee Camilla.

“I can only repeat what I’ve said before if invited, I will always do my utmost to help you and Charles to the best of my ability,” Prince Philip wrote on July 7, 1992. “But I am quite ready to concede that I have no talent as a marriage counselor.”

However, Princess Diana had reportedly felt bad with her father-in-law after learning that Prince Philip encouraged his son to marry her anyway despite his reservations while promising Prince Charles that he could get back with Camilla if his marriage with Princess Diana doesn’t work after five years.

In a taped conversation, Princess Diana admitted that she sensed that something was happening before her split from Prince Charles. On the fifth year, she had the confirmation she was looking for.

Biographer Penny Junor wrote in her book “The Firm” how Queen Elizabeth II and Prince Philip were too late in helping Princess Diana and Prince Charles in their troubled marriage. According to Junor, the senior couple’s intervention was too late because Princess Diana had already gone public and was intoxicated with the power that she had over her husband that she even announced that she wanted a trial separation.

Prince Philip, Prince Charles and Queen Elizabeth II
Pictured: Prince Charles, Prince Philip and Queen Elizabeth II from the Balcony of Buckingham Palace during the 'Trooping of the Colour' June 16, 2001 in London. Getty Images/Anthony Harvey