but it wasn't always the case. they came from pretty modest upbringing, a modest start in life. and it was really because of carol's desire to improve their position and to build that family business. >> they sold supplies for children's parties and soon spun it into an online internet empire worth millions. >> it was carol who saw that this business really had legs to grow. and of course, when that happened and there was money in the bank, they decided to invest in their children's education. >> as the middletons saw success, they sent their kids to private schools. kate was 13 when she came here, arriving confident, happy. but that would soon change. >> she went in at the age of 13 rather than 11. most of the girls had started at 11, so they were already -- >> they already had their circles. >> they kid. and it was very difficult for her to find her feet. >> she became the victim of the mean girls in the school. there was malicious gossip about