1. Stay calm: Although this behavior may be unpleasant, try to stay calm and rational and avoid getting too excited or overreacting.
2. Communicate with your family: If you feel scared, uncomfortable or worried, you can communicate frankly with your family. Tell them your feelings and concerns and ask for their support and help.
3. Seek professional help: If your brother's behavior has lasted for a long time, or affected your daily life, please consider seeking professional help, such as the advice and support of a counselor or psychologist.
4. Protect yourself: ensure personal safety and privacy. Try to avoid being alone with your brother and ensure the safety of your residence and valuables.
5. Record evidence: If possible, keep any evidence or clues related to your brother's abnormal behavior. This helps to prove to your family that your concerns are well-founded, or to provide more information when seeking professional help.
6. Seek support: Share your troubles with trusted friends, family or teachers. They can provide support, understanding and advice to help you cope with this situation.
Above all, don't take on this problem alone. Sharing your feelings with others and asking for help are the key to solving the problem.