Experts uncover Princess Diana’s true relationship with Princess Margret Entertainment Experts uncover Princess Diana’s true relationship with Princess Margret Royal experts have come forward to shed light on Princess Diana’s relationship with the late Princess Margret. A report regarding her relationship with the Queen’s sister Margret s brought forward in a Princess Diana documentary titled, Diana: Her True Story in Her Own Words. In the documentary the narrator was heard saying, “She banned any pictures of Diana on magazines, she wouldn’t have anything to do with her.” Even Craig Brown, the author of Ninety-Nine Glimpses of Princess Margaret touched upon the alleged relationship the princesses shared and claimed, “She wouldn’t even have magazines with Diana’s face on the cover nearby. She would turn them over.”