You said in an earlier post that your family loves you, so hopefully that will be a comfort to you.
The others in your family probably just can't face the truth and for whatever reasons, don't seem to have the courage and clear-sightedness that you do.
Little do they know that in reality, you are a beacon of light.
This changing family dynamic is one more thing for you to bear, on top of everything else - you surely are a very strong person.
I've long been an oddball in my family, largely due to my beliefs about health and my opposition to drugs and the medical system. They love me anyway, and we often steer the conversation in other directions. They just don't want to hear about it. It's hard to watch them suffer, but, for whatever reasons, it's their choice.