Thank you for writing us. You don’t need to stay or continue to tolerate an abusive environment. The first thing I would do is talk to your siblings about your home life. They lived through it and might be able to offer some guidance and direction.
I would then talk to your school’s guidance counselor. You won’t be the first student they will have helped with a difficult home situation. You may also want to talk to a supportive teacher. Finally, if things get to where you need more direct and stronger help each state has a protective service for children that you can call to get support. You can find the contact information here, and additional support here.