Japan’s Marie Kondo is known around the world as a cleaning expert and for helping people organize their homes. Her 2014 book The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing has sold millions of copies. But not even Marie Kondo can follow all of her cleaning rules all of the time. The reason? Well, there are two really good ones. Her young daughters, Satsuki and Miko. The girls are now ages four and three. Marie Kondo wrote her famous book before she became a mother. At that time, she aimed for a perfectly organized home. That is what she told reporters for The Associated Press in November. She added that she now understands two important things about parenting: First, children often make a mess. And second, time and energy are limited.