A source tells PEOPLE that the Duke and Duchess of Sussex have not received an invitation to this year’s royal Christmas gathering at Sandringham. The couple, who are expected to spend the holidays in the U.S., haven’t taken part in Christmas with the royal family since 2018, the year they married.

Kate Middleton, Prince William, and their children will join King Charles at Sandringham for a deeply emotional Christmas, following health challenges.

The royals have many long-standing holiday traditions, but there's one in particular that Kate thinks should get the axe.

Princess Diana's issues with the Royal Family's Christmas celebrations began right away with her first royal Christmas in 1981, according to her biographer Andrew Morton, author of Diana: Her True Story in Her Own Words.

Christmas at Sandringham, a tradition for members of the royal family, will be a slice of normality for the couple at the end of a very atypical year