The Royal Family has a number of Christmas traditions they follow each year - but back in 2016, the Wales family opted to spend the big day with the Middletons instead
This article describes how Prince William and Kate Middleton broke with royal tradition by spending Christmas Day in 2016 with Kate's family, the Middletons, in Bucklebury instead of with the rest of the Royal Family.
It highlights this as a notable departure from the usual royal Christmas customs and indicates that the Middletons' Christmas was a more informal and "riotous" affair.