OK, so there's some serious shit going on with my mom situation. CPS was called.

I can only agree with Chip. The fact you stated you have problems to accept authority means to me that it is exactly what you need.
Don't get me wrong, I am not saying that you're immature and I know you have been through a lot of painful things and had to take care of yourself. But this is something I have learned from being a teacher : children and teenagers needs authority. They need someone to set boundaries.
First because, no matter how they dislike it, having someone who says "No, you can't do... whatever" is reassuring because it means someone care about what them. Second, because in society, they will have to deal with authority and boundaries, it is necessary, and so they have to learn deal with the frustration authority may imply when they're younger. Last but not least, teenagers build their personalities arround the rules their parents sets, wether it is by accepting them, or by trying to transgress them.
For all these reasons, I think it will be good that you live with your dad under his roof and according to his rules. I know this is probably not what you want to hear, but I think it will be a lot more healthier for you to get back to a normal teenager's life and that you'll have someone who'll care about you.
And I think that living with a parent you can rebuild a real relationship with would be way more healthier, not only for now but also for your future, than living with a parents you try to ignore and plan to cut every relationship with in a few years.
Now, of course, you're the only one who can decide, but I think it would be a sign of maturity from your part to decide to live with your father for your own sake, even if you know that's not going to be easy, rather than sticking to your actual situation while you perfectly know it's not good for you, neither now nor for your future.
Take care (*hug*), Cécile

 

I can somewhat relate to what you're going through since I've been through hell with my mom as well and had CPS called out 3 times so far, but I've never had to go through any physical abuse so that's sorta out of my league.
However from the times that I've had to deal with CPS I've learned that they normally don't do any follow-up checks unless the situation is extremely bad which would put it as far worse than your's. You shouldn't have any real problems with them during your meeting at school unless you're like covered in bruises/cuts.
If living with your mom would make it easier for you but living with your dad would be safer, then that could be a somewhat hard decision to make. Living with him might give you some tolerance for authority but sometimes it just might not be the right time to deal with it. I think you should just follow your own path on this one since you're the person that has to ultimately deal with everything.
Good luck with everything (*hug*)

 

Well, I have no experience at all with CPS, but here's what I think: You want to cut your mother out of your life, and CPS is giving you a chance. You can go live with your father and not have to worry about providing food or getting hit, and have a bit of your childhood back before it's gone. Yeah, you'll have to deal with rules, but that's how life is. If you can't follow rules, you'll end up in prison as well. CPS is offering you 3.5 years of safety where you don't have to worry about protecting yourself or your sister. Maybe you should give it a try and see how it goes.

 

I understand that you want to be your own person, to be 18 and legal, because you've been having to live with that responsibility for awhile. But you've got decades and decades to come where you will care for yourself--why not enjoy a caring and nurturing environment for the years before HS ends, which you can only get with your Dad.