If you want to see what life is like with a person with severe disabilities, check out the following report:
He really hits the nail on the head, outlining the sorrow, worry and joy that comes with living with a person with disabilities.
The part about the 'clicking' really struck me. It's amazing how you learn to communicate with people who cannot communicate normally. My foster brother was never able to speak. When you spent enough time with him, though, you realized that, while words would have been nice, they were never essential to the conversation.