Off the top of my head:
The martins were there for a Father's Day trip.
(Granddad, dad, and the two boys)
Another family stumbled upon the Martins. Coincidentally their name was Martin as well.
The families visited and decided to let the kids play. The kids played hide and go seek. Dennis hid behind a bush about 50-60 feet from his father. His dad watched him crotch behind the bush.
Once the game was over, all the kids came out except Dennis. (He was hiding there approx a minute)
The father ran down the ridge roughly 2 miles looking for his son. Sent his father down the mountain for help.
They searched for this kid for a long time. Weather made it difficult. The green berets were called in.
Media reported they were already there. They weren't. They set up a base camp and helped looked for the boy, but not in a joint effort with the Park Rangers. They were also armed.
Another family not aware of anything that is going on, asked another park ranger where they could go to see wild life. He told them where to go. The family (Keys) stated that they saw a wild man covered in hair running through the woods with something thrown across his shoulder. They reported it the Rangers and fbi. The fbi dismissed it, stated it was no way that the kid could have been carried that far.
(Later disproved by a park ranger and a investigator)
The father later found out about the report and questioned the fbi and they told the dad it was not possible to have happened. The Keys said it did.
Some have speculated the boy was accidentally kidnapped by people who mistook the boy as the other Martin boy (two families with same last name)
This is just some of it. But you get the idea.