Interesting read (all 3 pages of it).
I think his dad is lying about a few things.... like sticking to the "F" drawing, and "forgetting" the nose.
Fact is his dad has been silently been saying something to his son, which I feel will drastically alter their relationship once I reveal it to him:
First he draws an F
Then he draws a U
Then the ear is a C
With a disjointed K for eyes
Finally a bunch of shapes which which are hard to decifer,
but the mouth has a U