Imagine that you’re a kid in class and your friend throws an eraser at the teacher. You’ll pretty quickly hear and/or see your friend getting in trouble from the teacher - but not if you’re deaf-blind, unless someone tells you.

Everything that you learned by seeing, or hearing, things happen around you just isn’t there for deaf-blind people.

For those who are involved with deaf-blind children, I implore you, I beg you, I entreat you, do anything and everything you possibly can to get as much language into that child before he/she hits puberty as you can. Be it ASL (although it will have to be dumbed-down a bit, usually, as it’s hard for deaf-blind people to pick up the facial grammar of ASL because usually they can’t see it), hand-under-hand signing, picture-symbols for kids who have residual vision, two-hand manual alphabet in the hand, Braille-typing on the fingers as they do in Japan sometimes… whatever it takes, you need to stuff that kid’s mind with language all day, every day, via every channel you can think of.