My sister asked my brother for help, but my brother refused. How can I ask my brother for help, how can I persuade her gently, and how can I use text messages?

Ask him what's wrong. If it is, leave him alone.

If you are brothers and sisters, there is absolutely no need to toss these things. There must be a reason why he didn't help. He has helped what he can.

If you are cousins, tell me about your childhood and tell him that you really need help, and what will happen if he doesn't help.

If you are brothers and sisters who are not related by blood, you can try to say something sad between you and tell him that you really need his help. If he doesn't help again, forget it and tell him the consequences lightly.

Finally, I want to tell you that if you ask him for help, he doesn't like it or violates the principle, please be careful. Getting sympathy in this way may hurt your feelings.