Hi there
Thank you for your letter. It's not right that you are being bullied and that you feel the only way to stay safe is by locking your door. It's not surprising that you feel scared. You also seem to be getting mixed messages from your mum - although she has told you to let her know if it happens again, when you have she has not responded how you expected. I wonder whether your mum needs some help in supporting you with this, and in stopping the bullying. Is there anyone else in your family, or maybe a family friend who could also talk to you and your brother, and help to resolve the situation?
Have a look at the bullying section on the ChildLine message board to see what ideas others may have. You deserve to be treated fairly, and the bullying should stop. You can also speak to a ChildLine counsellor on freephone 0800 1111 or on a 1-2-1 chat through the ChildLine website. I hope that this situation is resolved very soon.
Take care
Sam