If something happened to John and they found him, the first thing they’d do is seek out help from one of the family friends. Bobby or Pastor Jim would know what to do!
Dean doesn’t have a driver’s license since he’s only 14, but he definitely knows how to drive the car (and knowing his dad, he might even have a fake ID of his own just in case he needs to pass as old enough to drive). They’ll get John there and get help.
Both kids freaking out the entire way. This is not what they expected to have to deal with.
It’s probably a lot easier to put up with John’s scolding when he’s itty bitty at least.