After marrying King Charles on July 29, 1981, Princess Diana became a member of the British Royal Family. As a result, Queen Elizabeth II and Prince Philip became her in-laws. After Charles and Diana separated, Elizabeth and Philip reportedly weighed in on the couple's issues, and some of their comments allegedly made the former Princess of Wales's "blood boil."
In the book A Royal Duty, former butler Paul Burrell recalled Princess Diana's reaction to some of Prince Philip's accusations about her marriage.