You didn't say where you are, but many cities have Deaf and Hard of Hearing advocacy groups. You should reach out to them for resources for your teammate but al

You didn't say where you are, but many cities have Deaf and Hard of Hearing advocacy groups. You should reach out to them for resources for your teammate but also for you. They'll probably bend over backwards to help! Also, unless your teammate is actively involved in whatever actions you take, you need to make sure they want help and that they communicate to you what they want help with. The last thing they want is an overconcerned workmate who gets in their business to "help".