Prince William: Princess Charlotte, Unlike Me, Learned How To Floss When She Was 4 Years Old

Prince William has shared some details about his family that may surprise even the biggest fans of the royal family in his new ITV documentary, Prince William: A Planet for Us All.

During the visit to Liverpool, described in the film, 38-year-old William meets and surprises a group of children who have built a huge hotel for insects, which they fancifully called "Buckingham Palace." In addition to discussing the importance of insects to the environment, the children asked questions about the royal pope's children: Prince George, 7, Princess Charlotte, 5, and Prince Louis, 2.

“Is Princess Charlotte more sassy than Prince George?” Asked one child, in agreement.

“No, she's just as cocky as her brothers, they are worth each other,” William replied. "They are very cocky."

Meanwhile, another student asked the father of three if George taught his siblings to floss.

“No, Charlotte can floss her teeth,” William replied, noting that their daughter mastered it at age 4, and his wife can also practice the popular dance style

“Catherine knows how to floss, but I don't. It's like a terrible movie watching me floss,”he added.

In a new documentary, which airs in the UK on Monday on ITV, the Duke of Cambridge reflects on how his children have influenced his concern for the environment.

“I really want to make sure that 20 years from now, George won't turn around and say, 'Are you ahead of your time? Because if he does, we'll be late,”says William.

“Now I have George, Charlotte and now in my life there is also a son, Louis, from this realization your worldview really changes. You want to pass on nature to the next generation in a much better condition than it is now,”he adds

Although his children are still young, they already share their father's love for nature.

Over the weekend, William and Kate posted some adorable photos of the family in the gardens of Kensington Palace, where they meet one of their favorite TV stars, Sir David Attenborough.

And on Saturday, a video was released in which three children ask a respected naturalist a question, helping to raise awareness about the problems of the natural world.