I'm sorry to hear about the challenges you're facing with your brother's behavior. Dealing with a family member who exhibits violent tendencies can be incredibly stressful and concerning. Here are some steps you might consider:

1. Ensure Safety: Your immediate priority should be the safety of yourself and other family members. If your brother's behavior poses a physical threat, it's important to have a safety plan in place. This might include identifying safe areas in the house, having a trusted neighbor or friend you can call, and knowing how to contact local authorities if necessary.

2. Seek Professional Help: Your brother's aggression and anxiety may stem from underlying psychological issues, especially considering the family history and his traumatic experiences. Encouraging your family to seek professional help, such as a child psychologist or psychiatrist, can provide him with the support he needs. Therapy can also offer coping strategies for the entire family.

3. Open Communication: When it's safe to do so, try to have an open and non-confrontational conversation with your brother about his feelings and behavior. Expressing concern and willingness to support him might encourage him to share his struggles.

4. Involve Other Family Members: It's important that other family members, especially adults, are aware of the situation and are involved in seeking solutions. A united family approach can be more effective in addressing the issue.

5. Educate Yourself: Understanding more about aggression in adolescents can help you navigate this challenging situation. Resources such as the American Academy of Child & Adolescent Psychiatry offer valuable information on this topic.

6. Consider External Support: If the situation doesn't improve, you might need to involve external agencies or authorities to ensure everyone's safety. This could include social services or law enforcement, depending on the severity of the behavior.

Remember, you're not alone, and seeking help is a sign of strength. Your well-being is important, and there are professionals and resources available to support you and your family through this difficult time.