Although, I do have to admit, as ironic as it is, he did teach me lessons all parents should teach their kids.

He didn't even teach you how to talk. What are you talking about?
Did he teach you how to scavenge food?
No
Did he teach you how to spot dangerous creatures and either fight or avoid them?
No. Hanging you over a radscorpion one time for fun doesn't count.

If you don't even know how to talk then how do you know what books are and what written language is meant to do?

And so much edge, it'd be one thing if their dad was a raider or something and they were just a foal he'd captured.

I wouldn't go so far as to say the concept you have going on here is bad, but it's poorly executed and the internal logic isn't being thought out well enough.