Princess Diana's relationship with her father-in-law is a sharp contrast from the one she had with Queen Elizabeth. The two reportedly were not close, with biographer Andrew Morton writing in Diana: Her True Story (via Elle) that, while the queen was kind enough to her daughter-in-law, "it was governed by the fact that she was married to her older son and a future Monarch."

Morton wrote, "In the early days, Diana was quite simply terrified of her mother-in-law. She kept the formal obsequies — dropping a deep curtsy each time they met — but otherwise kept her distance."

It fell to Prince Philip to introduce Diana to royal life, explained royal biographer Ingrid Seward to Us Weekly, saying that he "looked after her" as he could relate to "what it's like to be the new boy on the block or the new girl on the block and suddenly come into this family with all their strange protocols and everything else."