Here is a sample template you can use to write an advice letter to your younger brother.
To [Recipient Name]
Subject: Advice Letter To Younger Brother
Dear [Recipient Name],
Hello, How are you? I am fine here, and I hope you are also doing well and good. I received your letter asking for my advice on [State the Reason for Advice]. I am pleased that you asked me to help you make crucial decisions for your life.
I think, you can [List the Advice]. This is what I believe would be the best solution to your problem. If you are still not sure, you can directly give me a call. We can discuss and come to a solution.
Your brother,
[Your Name]
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