Here are some tips to help you write a sincere and meaningful letter for Write a letter to your sister: Start with a warm greeting: Start your Write a letter to your sister with a warm and personal greeting, using your sister's name. For example, “My dear sister’s name.” Express genuine emotions: Be sincere and authentic in expressing your emotions. 3. Be specific about the advice you want. You should ask the questions you want answered and write them down; ~ Most medical schools in the United States and Canada request letters of recommendation. Some schools may ask. The number will depend on your choice of schools, whether you are a nontraditional applicant, and other factors. Be sure to verify this information with each school. Here is an example of how to write a letter to your cousin in email format. Subject: I'll catch up with you. Dear cousin name, I hope this email finds you well. It's been a while since we've caught up, and I thought I'd take this opportunity to write to you and see how you're doing.