I (20f) Need Custody Advice...

Location: Florida

Ok, so I need advice, since shit's going down with my parents, and none of us kids want placed with our dad, and he's threatening to take my siblings.

For context, 10 years ago, my mom had an opioid addiction, nothing serious, but she did steal money from my dad, causing us to lose our first house. I have two siblings, (12F) and (15M), and ever since then, my mom has been sober from any opioids. She does take caffeine pills and Sudafed, but that's it.
There was also some other issues with my siblings, but thats neither here nor there. Nothing abuse, just kids being stupid and making mistakes.
Anyways, every time one of us kids or Mom makes a mistake, Dad will regularly remind us of these mistakes, stating that "Its on us to never forget what we did so we don;t repeat it"
Which is fine, if we weren't reminded of it every week.

So now, my dad thinks my mom is on drugs again because she was too slow to get the leafblower for him. More context, my mom works overnights and still does house chores, and gets maybe 4 hours of sleep regularly. On top of that, she is partially deaf and has a central spinal injury from years ago, causing neuropathy and chronic pain.

So, now Dad is threatening to take us away from her, even though she is the only one with a job in the house, and she is the one who takes care of all of us. I stay at the house too, helping with house chores, and going to school for my nursing degree. Per my father, i am not allowed to get a job because i need to focus on school, and can get one when i graduate. Dad, on the other hand, is retired, not working, and just sits inhis room all day. He has, during arguments,

1) pinned my brother against the wall by his neck for 'kicking' his sister (They were play-fighting)

2)Pushed my mom aside with the door while dragging me out to his truck so he can rant about how 'sinful' i was being (He found my journal talking about the crush i had on my female best friend. This was when I was 12-13)

3) Has called my sister a 'whore' before because she likes to wear make-up and was texting a friend of hers on my phone (I did not know she was stealing my phone in the middle of the night, i am a heavy sleeper and we share a room)

4)Has fat-shamed me and my sister for years because we have a bit of chunk (we are both shorter and are of mexican decent, as well as both of us being on the lower end of the healthy BMI for our respected ranges)

5) Hit my sister with a paintbrush handle repeatedly because her brother was trying to steal the switch from her, even though it was her day on it and she had swatted at him to get him to go away

Mom is genuinely worried he will be able to take us, and I wanna know if he has any legal say in things. I know I can't do shit because I don't have a job and are basically a free-loader, but I parent these kids as much as my mother does. I don't want them being with him.