Van,
Well, the parents knew from really early on that their son wasn't brain-dead, he just couldn't move.
So, everything else inside the power-house is working fine, and as such, I'd say that they would have taught him like any other child, but with the added difficulty that they couldn't get him to confirm that he understoon (except simple nods and shakes of the head, I suppose).
You can imagine reading to him; when young, you'd read to him with the book infront of his eyes, following the words with your finger. I'd say that he'd learn pretty quick like that.
Watching TV is another example. Alot of those kids shows for quite a while have little puzzles for them to solve, most of which involve identifying something on the screen (a letter, an object, etc). Very simple, but very effective!
Zotoaster,
That's a really nice story too
I can't imagine what it must be like to live with a disabled person, it must be so draining at times having to look after him or her. But, if, like in your case, she is the happiest person in the world, it'd make it all worth it wouldn't it?
Everyone else,
Don't thank me,
Thank them!
I just linked you to a video, they're the people, and they really exist - shoot them an email, you'll be happy that you did