You can’t. But you can begin to start a ripple affect in your family by getting help for yourself. No matter how skilled we are, it is still almost impossible to make an adult do something they are not, themselves, ready to do. All you can do is, – 1) not make it too comfortable for them to remain the same 2) keep expressing concerns in as non judgmental a way as possible 3) believe in them and provide them with resources they can access when they’re finally ready and 4) believe in yourself and get help for yourself. It is almost impossible to keep doing all this without support. You might want to try getting self help support from AlAnon or NarAnon (see links). Or you can seek professional help at an addiction treatment facility such as Rideauwood, which helps family members even if their addicted family member is not ready to get help.