If you would like to give some advice to your brother, here is a sample template you can use to write an advice letter to your brother.
I hope this letter finds you in the best of health. I would like to tell you that I received your letter seeking advice regarding [enter topic]. I am honored that you resorted to my advice on this matter.
You are very sincere and focus on everything that you do. I have read your letter thoroughly and understood the matter. I would like to tell you to [enter advice] with my years of experience and understanding. I also suggest you analyze my advice properly and then act on it. I hope that this letter helps you in your matter.
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