The Times of London article, written for Kate Middleton's 40th birthday, also reports that she eased the tension between Prince William and Harry.
Kate Middleton, who turns 40 on January 9, and Meghan Markle were both regular people before they married into the royal family.
In March, Prince Harry and Meghan Markle spoke with Oprah Winfrey for their first sit-down interview since leaving their royal duties.
Meghan Markle previously sued The Mail on Sunday's parent company for publishing excerpts from a handwritten letter addressed to her father.
The rare picture of Prince Harry, Meghan Markle, Archie, and Lilibet shows off just how much Archie looks like his dad with their matching red hair.
Prince Harry and Meghan Markle's holiday card photo was taken at the couple's Santa Barbara home, and shows the family of four for the first time.
"She is somebody who we can count on to tell the truth," David Boies, the attorney representing Virginia Roberts Giuffre, told The Daily Beast.
The British royal family has many traditions dating back centuries — particularly around the holidays.
Christopher Andersen, royal author and former editor at People, said the allegations that Meghan Markle bullied staff stemmed from "a culture clash."
For more than a century, the royal family has sent Christmas cards to their subjects. The photos show historic events or intimate family moments.
Almost two years since announcing his departure from royal life, Prince Harry says quitting can be good for your mental health.
"The Prince" spoofs the British royal family and portrays the late Duke of Edinburgh as a drooling old man who can't chew his own food.
The Duchess of Sussex experimented with a mixture of royal and California style at interviews and engagements throughout the year.
Markle said in a statement that the British newspaper had treated the lawsuit like "a game with no rules."
Trump called Markle "disrespectful" to the royal family and the Queen, and accused her of "inappropriate" behavior for lobbying members of Congress.
The Duke and Duchess of Sussex previously told Oprah Winfrey that an unnamed royal had racist conversations about their children's skin color.
Part two of the BBC docuseries will cover Prince Harry and Meghan Markle's fraught relationship with the royal family.