Inside Prince William and Kate Middleton's Kids' Life and Royal Duties

Katie Nicholl, author of 'The New Royals,' speaks with ET's Rachel Smith about what lies ahead for Prince William and Kate Middleton's children. The royal expert breaks down the special bond between Prince George and Prince Charlotte, and how Prince Louis fits into the larger picture. With the family moving to Windsor, Katie also explains why the change in location is significant for the Prince and Princess of Wales. Katie's book is out now.