My sympathies!
I often get "yeah yeah yeah yeah" while I'm explaining.
However, my mother is now refusing vaccines, and that's a result believe me!
My OH now believes, and takes colloidal silver.
Don't get in a panic about your nearest and dearest, they have to make their own decisions - but if the information is drip fed to them, they can make informed choices.
I am noted for promoting D3 and vitamin C in a few forums, and people are listening. Some folk have refused Tamiflu and Cervarix because of my 'drip-feeding'.
You can change the world 1 person at a time - good luck, don't give up