Kate Middleton lays down some household rules at Adelaide Cottage in Windsor

Kate Middleton and her husband Prince William reportedly have one firm household rule that their children Prince George, Princess Charlotte and Prince Louis must stick to. 

As a mum of three young children, the Princess of Wales has often opened up about how hard bringing up children can be.

Both husband and wife have a life laced with royal responsibilities alongside raising their children. 

Although they do have the help of a nanny, the royal couple is often seen dropping off and collecting their children from their new school and are said to love taking part in activities such as bike riding and baking.

But it's not all fun and games for the children as William and Kate reportedly want them to adhere to some strict rules at home. 

And according to a source, this rule is that there should be no shouting in the house. 

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

But rather than be sent off to their bedrooms or to the naughty step when they act up, the royal couple have a different technique - the sofa chat.

"The naughty child is taken away from the scene of the row or disruption and talked to calmly by either Kate or William. Things are explained and consequences outlined and they never shout at them."

Earlier this week, Kate launched her Shaping Us initiative, an ambitious campaign described aimed at raising the profile of the crucial period of a child's development, from pregnancy to the age of five.