I fear for the worst on the dad. Cold weather, lost.
I live, own, and operate a ranch near this area. One: You don't drive over that road in the winter unless you are absolutely positive the road is cleared and inclement weather is not imminent. The snow can come very quickly and can make driving impossible in less than an hour. And if you're all the way to Eden Valley, you won't be able to walk out.
The road is paved, narrow, no guard rails, road markings, and at night, dark as the back side of the moon. Maps all show it for a nice ride. Maps are flat, this road changes elevation seveal times in thousands of feet. And last, no cell towers. Its 85 miles of desolate, towering forest, no lights, habitations, nothing and in the winter, will kill you quick...