Sorry, TMZ is a shit source.
Here is the exact admission from him.
Twelve years ago, as a young teenager, I acted inexcusably for which I am extremely sorry and deeply regret. I hurt others, including my family and close friends," Josh, 27, tells PEOPLE in a statement. “I confessed this to my parents who took several steps to help me address the situation. We spoke with the authorities where I confessed my wrongdoing, and my parents arranged for me and those affected by my actions to receive counseling. I understood that if I continued down this wrong road that I would end up ruining my life.”
Here is the supporting evidence for him molesting his sisters on the police report- Imgur: The magic of the Internet
Here is a timeline of his crimes-
http://defamer.gawker.com/the-web-has-known-about-josh-duggar-for-years-when-did-1706258269
