Give the letter one purpose
Start by deciding what you are asking for: a conversation, a professional consultation, or permission to explore support together. A letter that tries to settle years of conflict can bury that request. You can write a private first draft without deciding to deliver it.
A qualified professional can help you consider whether a letter is appropriate, who should read it, and how to respond if your loved one wants to stop. Do not arrange a surprise confrontation because a template makes the preparation look complete.
An example, with its limits
The following is a fictional writing example, not a testimony or a script for every family:
I care about you, and I miss having time together that feels easy. When our plans were canceled recently, I felt worried and unsure how to help. I do not want to make assumptions about what you are experiencing.
Would you be open to talking about support options with someone qualified? If you want, I can help gather questions or look at appointment options with you. I also want to hear what concerns you about getting help.
The example names the relationship, describes an observation, asks rather than diagnoses, and offers a limited action. It deliberately does not threaten housing, custody, money, or treatment consequences. Those issues can carry serious safety and legal implications and need individual guidance.
Make room for their answer
Do not treat a prepared letter as a speech that must be finished regardless of the other person's response. Ask a professional how to handle pauses, disagreement, distress, or a refusal. You do not need to collect statements from everyone in the family.
SAMHSA's conversation guidance emphasizes listening and open-ended questions. The worksheet below is an organizing aid inspired by those principles, not a clinical method or an automated letter-writing service.