Well, FWIW, here's my theory as to why they treat you differently. You had a hearing loss while you were growing up and living with them and maybe they just weren't up to making all the accommodations necc. for you then because it was a 24/7 situation. It's a lot easier to accommodate someone that you only see a few times a month for a short period of time. And, while you were a child it was much easier to say you didn't need that kind of accommodation than admitting that they didn't want to deal with any inconvenience.
If they start accommodating you now, on a certain level they will realize that they should have accommodated you earlier and they just don't want to deal with the guilt.
That's my theory anyway.
My family is not so different than yours, I think.