Young couple goes on van tour of US, boy comes back with van - no girl

So in regards to parents... If they can prove somehow that they aided Brian in evading arrest, and if he is never found, could it they be charged w a higher crime than just aiding and abetting? Like accessory to murder?

I think they’re the same thing. Accessory is the modern name of the charge.

So not quite right on that. A&A happens before the crime, accessory (after-the-fact) happens after.

https://www.findlaw.com/criminal/criminal-charges/aiding-and-abetting-accessory.html