The Cambridge's all attended Prince Philip's memorial service on29 March, except for the youngest child in the family, Prince Louis.
Princess Charlotte, six, and Prince George, eight, were on their best behaviour for the tribute, which took place at London's Westminster Abbey.
Onlookers noted how well mannered Kate Middleton and Prince William's children were, as they reined in some of their witty antics, such as pulling faces to onlookers when they were younger at Trooping the Colour.
The Duke and Duchess' children held onto their hands as they walked into the London landmark, but at moments the duo seemed to be overwhelmed and anxious - we don't blame them.
At one moment, a nervous Charlotte looked to her mum for support, and Kate, 40, whispered some words of encouragement to perk her daughter up. But what was said?
According to the Mail Online Kate whispered three words of encouragement.
Lip reader, Jacqui Press, claimed Kate said "You can smile" to Charlotte, which appeared to calm her before she shook hands with the Clergymen at the service.
George also needed a little boost of confidence on the day, which Prince William, 39, picked up on instantly.
Body language expert, Nick Davies, said you could see George was apprehensive prior to walking into Westminster Abbey.
He told The Daily Telegraph: "George takes a deep breath quickly, gulps and licks his dry lips which is caused by pre-emptive anxiety, but he maintains good eye contact and once he is spoken to by one of the clergymen he breaks into a broad smile showing his confidence.
"However, once his father talks to the Navy gentlemen with the gold braiding, George’s mouth tightens to the left and he rubs the bottom of his jacket with his right fingers, showing he feels awkward and is seeking comfort, William naturally recognises this putting his hand on George’s shoulder."
Round of applause for Kate and Will being the attentive parents we love to see!
-
As a Health Editor, trust me when I say: you need to know about this new-gen at-home STI screeningIt's proving seriously impressive.
-
This under-the-radar Jo Malone perfume is easily one of my most complimented—and I think it deserves more praise
The epitome of luxury
-
My home must smell cosy at all times—these are the 13 Christmas candles that *really* deliver this year
I'm already burning them
-
Kate took elocution lessons to sound 'more posh' than William, according to a royal expert
Apparently the Princess had several sessions
-
Prince William and Kate Middleton's rare PDA was caught on camera during a royal outing
A sweet and candid moment
-
William and Kate would 'refuse to attend' royal Christmas if Harry and Meghan were there
Uh oh
-
Prince William fields a cheeky question about his bank balance during a royal engagement
He was put on the spot by an inquisitive 11 year old
-
Prince William is determined not to repeat Princess Diana's parenting 'regrets'
"His children's needs come before royal duty."
-
Prince William reveals Louis' favourite band — and it's the cutest thing
We love this
-
This was Kate Middleton's biggest struggle when she joined the Royal Family
Her fear is very relatable
-
Prince William says he wants to go 'one step further' than his family as King
He opened up about his desire to 'bring change'
