This goes to how the laws are worded when they are passed. Some laws require intent to face repercussions, others do not. A prime example: Hillary Clinton and mis-handling classified information. As the law was written, being ignorant of how to properly handle the classified information was irrelevant to the crime. Not all of us can be a Clinton and bully others into dropping charges. Firearms have some of the most stringent laws, and being ignorant of activities does not necessarily make you non-prosecutable. As I understand the law, the father-in-law does not have to be aware of how the router is being used in order to be prosecutable. However, I do recommend getting competent legal counsel to be sure.