It doesn't matter to me that Tom can't produce grandfather's birth certificate. I doubt if the old guy ever left a trace of his passing.

I'll never forget how Tom told me in the Standard Class, that most people go into the wilds like a scuba diver into the water, into an alien environment, with sophisticated equipment crafted by an advanced technological civilizaion, without which the diver would not survive a few minutes. He said, I am instead going to show you how look at those woods like they're your home.
Now whether Tom made this all up, or actually learned from Grandfather, or some combination of the two, doesn't matter to me, since he taught me in the style of those who came before us, for whom escape to civilzation was impossible, so they thrived, not survived, in the wilderness, and gave birth to generations of babies there, and celebrated the spirits of the wild in their own way.
Seems to me that too many survivalists look at nature as an enemy to be contended with. I prefer, with Tom, to cherish our wild heritage, and to love Nature in the way of our ancestors.