According to the accounts we’ve all heard, Josh confessed his sin to his parents as well as to the proper authorities, and as a family, they worked through the issues.
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This makes it sound like Josh brought it up when it is my understanding the girl he molested that was not a family member was the one to come to the parents first, which didn’t leave much choice about going to law enforcement — and then lying about the punishment from that point.
According to the police report, IF I'm reading it correctly - it's difficult to understand with all the redacted portions - the girl who wasn't a family member didn't know what happened until his parents told her parents and made their son confess: