Thanks for being there for your cousin.
When the time is right, introduce him to
$1. Tommy is an incredibly warm, intelligent, funny guy who happens to have been blind since birth. He has a wonderful series of videos where he shares what it's like to be blind in various normal, everyday situations.
In one of the more recent pieces he visits
$1. Pay attention to how his tour guide, Jackie Cannata, behaves. She sets a great example of how to engage and interact with a blind person.