Sam is Learning to Read was a YouTube video made back in December 2013. Samantha, a teenager with Rett Syndrome, is working on letters, phonics and blending.
And now, today, Sam IS reading! She read three of these cards on her own and answered the question. Here is one of the times:
So to make a long story short - children, teens and adults with multiple disabilities including complex communication needs (CCN) CAN learn to read. Never doubt it! Presume Competence!!!