Not to mention the other way around. One of your sons has gone missing, his older brother was previously molested by a guy and you can be pretty sure he's still in the same area. And that guy isn't the prime suspect for you? You don't go to the police and say "Hey, our kid's missing. There was this guy one of our other kids got molested by. Should probably look into him, see if he knows anything, he's definitely already on the sex offender registry"