• The whole Royal Family was out on Christmas Day
  • William and Kate's children made a big appearance
  • This is how Prince George followed in his father's footsteps

This Christmas Day, the British Royal Family gathered for the traditional service at Sandringham. Prince George, Princess Charlotte, and Prince Louis were not to be missed.

A body language expert even took a close look and noticed: With a loving gesture, Prince William's eldest son George followed in his father's footsteps.

See the pictures in the video above.

What a body language expert saw in Prince George

"One of the sweetest and most poignant body language signals was the sight of George using touch, chat, and bending rituals to signal he is now in the role of protector and 'keeping-an-eye-on' monitor for his younger brother Louis," body language expert Judi James told the Mirror.

This mirrors the relationship between Prince William and Prince Harry when they were around the same age, explains the expert.

"The gesture looked spontaneous, as though this is a role he is taking on a lot," Judi James says.

Also interesting:

Prince Harry's Netflix documentary includes footage showing Harry and William at a young age.

"William was shown in caring mode for Harry back then, just as George is now with Louis," James compares the sibling relationships.

George, Charlotte, and Louis at the Christmas service

You can tell that Prince William and Princess Kate's children are growing up fast. The body language expert sums up:

"Charlotte was pulling ahead as they walked towards the church and George has gone from being the rather shy-looking boy holding his father's hand to the older brother keeping an eye on and showing nurturing and directional signals towards the four-year-old Louis."

Either way, the royal siblings have once again provided heartwarming moments for royal fans worldwide.

See photos and more in the video above!