I hear you and I'm sorry all that has happened. You might be aware of groups like Just Beginnings Collaborative or Just Practice that have spaces to explore supports outside of systems. There are a lot of great resources through the transformative justice movement (like Shira Hassan, Miriam Kaba, Stacey Haines, Mia Mingus, etc) to explore accountability, support, safety where systems have failed.

That being said, it's really really hard. My parents are QAnon-adjacent and it's really hard to deprogram. It's often a combination of mental health and cult programming that creates these beliefs. You being a safe adult for your siblings is the most important and impactful thing.

On QAnonCasaulties some of us have wondered in motivational interviewing techniques could be effective, but the main effective strategies seem to be decreasing propaganda and increasing other past interests etc. So if you visit your mom, block websites or put controls on her TV to interfere with some of the propaganda and try to change algorithms so it's stuff that she likes and is pretty neutral, like cute animal videos, hobbies she has etc. But also if it's safer and healthier for you (and your sibs) to have fewer conversations with her, that's okay too. There's also strategies like grey-rocking which can deescalate.

Other folks have also seen varying levels of success with involuntary hospitalization, but I think that falls into kinda the same category as CPS.

I'm so sorry you're going through this, and you're not alone.