As I understand from the article:

While 835 million sounds like a lot of money, as a percent of the the value of Ancestry it is not much. Permira owns 50% which they bought for 1.6 billion. That means the company is valued at 3.2 billion. That is about 2.6% of the value of the company.

What is you debt as a percent of your net worth. On the average I would suspect significantly more if you consider your house, car, and such