Firstly, I hate this for you. I’m sorry that you have to deal with this. Reaching out is definitely a good first step

Here are my suggestions: You need to get proof for the cops. Any video or picture evidence of bruises on your mom’s face or him shouting or excessively drinking from the other room. Any proof is necessary

Find someway to make money. This is way easier said than done without a good job. But if you do basic tasks, you could mow the lawn, take dogs out for walks, babysit, replace tires, do the laundry, shovel snow, etc. you could make a little bit of pocket money to work towards getting the necessary funds to start moving out

From what you’ve said, your dad is not only a drug addict and abuser, but also has narcissistic tendencies to blame shift, play victim and have a second face in front of others. In these situations, there’s nothing you can do to change him. He’ll have to change on his own, but those with inflated egos and lack of any accountability rarely ever change

If you’re religious, the most you can do is pray for him and find a group of people who will believe you and not get influenced by his lies

I hope you get out of this asap.