Princess Margaret, Queen Elizabeth II
Pictured: Princess Margaret, the Queen play with their pet chameleon July 8, 1941 on the grounds of Windsor Castle, Berkshire. Getty Images

One member of the royal family reportedly grew up with an imaginary friend.

In the Channel 5 documentary “The Royals at War,” royal historian Kate Williams said that even though Queen Elizabeth II and Princess Margaret were sisters, they couldn’t be more different from each other.

“Elizabeth was conscientious, dutiful, organized, methodical, always doing exactly what was expected of her. Margaret was impulsive and fun, she was very often naughty,” Williams said.

While the two sisters were growing up, Williams said that Princess Margaret had an imaginary friend whom she named Cousin Halifax. The late royal blamed her imaginary friend for everything that she did wrong.

Meanwhile, royal correspondent Victoria Arbiter also said in the documentary that Princess Margaret and Prince Harry couldn’t be more alike because they are both cheeky and impish.

“She was like Prince Harry. She was the one with no responsibility but all the privileges,” she said.

Princess Diana’s former royal butler, Paul Burrell, weighed in by saying that Princess Margaret used to have one rude habit. Princess Margaret had the habit of standing in front of Burrell with a cigarette in her mouth and blowing the smoke into the butler’s face.

Burrell said that he didn’t mind what Princess Margaret was doing but couldn’t deny the fact that it was rude of her to do so. Unfortunately, the former royal butler also knew that the Queen’s younger sister was a certain creature that was born at a certain time that’s why he couldn’t change her.

When Princess Margaret and the Queen got older, the monarch faced a major crisis because of her younger sibling. Princess Margaret’s affair with Captain Peter Townsend blew up in the news around the same time as the Queen’s coronation.

While there, Princess Margaret was spotted picking fluff out of Townsend’s coat. In the book “Elizabeth: The Queen Mother,” biographer Hugo Vickers said that the incident resulted in Townsend being sent to Brussels to stay away from Princess Margaret.