Prince George and Princess Charlotte are tipped to help Kate with Prince Louis in a sweet move.
The royal youngster is celebrating his sixth birthday on Tuesday, and his two older siblings will likely be on hand to enjoy the celebrations.
Prince George, 10, and Princess Charlotte, eight, live at Adelaide Cottage with their younger brother Prince Louis, who turns six tomorrow.
Their mother, Princess Kate, previously lifted the lid on how she likes to celebrate her children's birthdays.
She told Mary Berry in 2019: "I love making the cake.
"It's become a bit of a tradition that I stay up 'til midnight with ridiculous amounts of cake mix and icing, and I make far too much. But I love it."
It is very likely that George and Charlotte will be on hand to help their mother this year, as it is known that they enjoy cooking and baking.
In 2022, Kate took to Instagram with photographs of her three children baking cupcakes for the Platinum Jubilee.
The Princess of Wales also praised her children's skills at cooking savoury dishes, saying: "I've done that with George and Charlotte – making pizza dough. They love it because they can get their hands messy."
In March, Kate revealed she had begun a course of preventative chemotherapy following her abdominal surgery two months before.
She has since been recuperating in private with her family, travelling to their country mansion Anmer Hall for the Easter holidays.
The family has since returned to Adelaide Cottage in Windsor, as George, Charlotte and Louis all attend Lambrook School.
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George, Charlotte and Louis prepared a sweet gesture for their mother before she arrived home from The London Clinic, according to a source.
At the time, the source told US Weekly: "They’ve all made her some ‘get well soon’ cards along with some of her favourite snacks."
Princess Charlotte and Prince George will likely take the reigns and make similar gestures for Prince Louis on Tuesday while Kate continues to recuperate.