In the end, Meg Barclay , you have not one iota of control over anyone but you. And what other people do is not about you. I am in a similar boat with my family, only it’s addiction for me. My father and brother are raging addicts. But I’ve openly ADMITTED to being an addict. And even though that means I’m getting better while they’re getting worse, because I told the truth, I am now ever the scapegoat for anything that happens. They will find some way to link it to me (from over 6 years ago) before they’ll dare take even a glimpse into themselves.
In this situation and in yours, all you can do is be the example so that if one day they see the light, they’ll have someone to follow out of the darkness.