Any have experience tutoring children in special ed?

I've worked with mainly special needs kids but the kid (my cousin) I tutor now is kind of different.

He can remember the names and s*it of cartoons but can't even f**ing read, he lacks reading comprehension, he can't even sit and think long enough to figure out what "before" or "after" means when I refer to the alphabet or numbers. Just dumb as a doorknob. I find it ridiculous that he knows all this other stuff but can't remember a simple symbol and it's name (ex. a plus sign)

I need tips to help him retain information. Otherwise I'm thinking of just telling his mother I can't tutor him anymore because he doesn't try and think of answers nor does it seem like he'll ever actually pick up on the information he's receiving.

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Any have experience tutoring children in special ed?
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