Prince William and Kate Middleton joined the rest of the royal family for their annual Christmas walk in Sandringham on Christmas day, and were accompanied by Prince William's step siblings, Laura Lopes (aka his " secret sister ") and Tom Parker Bowles.

Prince William and Laura Lopes have been step-siblings for over two decades, but their relationship hasn't always been smooth sailing

Royal Christmas traditions are somewhat of a hot topic this time of year, especially when it comes to Prince William and his young family. Word on the street is that the Waleses plan to do the holidays their own way when they take the throne,