Princess Kate and Prince William's strict rule that means their kids don't eat with them

The and don't allow their three children to eat with them during official dinners and holidays, it has been revealed.

, 10, , nine, and , six, often have to sit separately from their parents during mealtimes, revealed a long-time royal chef.

Known for imposing rules as members of the Royal Family, Kate and William typically sit separate to their children as George, Charlotte and Louis reportedly "aren't allowed to sit with the adults until they have learned the art of polite conversation".

Former royal chef Darren McGrady is known to have spent over a decade working for Queen Elizabeth II, Princess Diana and Prince Harry, as reported by the .

Speaking to , he said: "The children always ate in the nursery until they were old enough to conduct themselves properly at the dining table."

Kate and William have also adapted their own version of the naughty step, in form of the 'chat sofa'.

They told : "Shouting is absolutely 'off limits' for the children and any hint of shouting at each other is dealt with by removal."

The source added that the children in question is taken away to sit with either Kate or William and spoken to in a quiet manner about their behaviour and that they never shout at George, Charlotte or Louis.

Princess Kate embarked on her first royal engagement of this year on Thursday with The couplemet emergency responders and bereaved families of Southport.