None of this is any of your fault and it breaks my heart to hear how this man is treating you and your family. Your stepfather is cruel and abusive; the language he uses& the way he treats you & yr younger brother is emotional abuse.
Your mom may be scared of him or she may be so sad her first marriage didn't work out& she doesn't want to break up another marriage and be alone again.
Tell yr mom how sad you feel, that you don't want to cause trouble, and that yo feel yr stepfather overreacts. You should also show her the letter you wrote this site and this answer I'm writing you back at a time when yr stepfather is not at home. This is a serious situation. This man should not be allowed to abuse you and your brother in this way.
If you feel yr mom is too scared to help, you can go to your dad. Take your brother, go to your dad and show him this letter. It is probably better for you and your brother to live with yr dad or another family member like an aunt or grandmother and just have yr mom visit you when you miss her- rather than live in this abusive situation.
If your mom or dad won't help, then go to a counselor in school or a teacher you trust and tell them everything. You have the right to a better childhood than this- and to be treated better. Also talk to your brother to make him feel better; tell him none of this is his fault; that yr stepdad is a sick man and that you both have to be strong and live somewhere else.
In the meantime stay out of yr stepdad's way, so he doesn't mistreat you. Tell yr dad everything and stay with him or someone else if yr scared yr stepdad will take it out on you- but don't keep quiet& allow this man to abuse you any longer. Don't be scared of him; he's just a bully.
If you have to, you can even call social services and ask for their help. Ask them to come without their saying who called them. But try going to your dad's at first and asking him or any responsible adult like a teacher for help.
I hope things get better for you and your brother.
