Prince William and Kate Middleton have one strict household rule for their children.

The rule is no yelling or shouting.

The family encourages open communication and talking about feelings.

When voices are raised, communication is paused.

The couple uses a "chat sofa" as a way to call "time out" and talk through feelings.

The children are never shouted at and are talked to calmly.

The no-shouting rule applies to the Prince and Princess of Wales as well.

The family's discipline rule helps present a unified parental front.

The rule and chat sofa are meant to foster understanding and find solutions to problems.