Rebuild the missing context
Assume the recipient will not remember every date, promise, or earlier conversation. For a message about how to set a boundary in a family group chat, use this factual base: identify the visit, topic, money, photo, event, care task, or comment that needs a limit.
Say what needs to happen next
State the decision, information, or practical action you need and include a real deadline only when one exists. State what is allowed, what is not, and how you will respond consistently. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Avoid making urgency into pressure
Do not threaten access to children or elders as punishment, and do not debate the entire family history. Use safeguarding, legal, domestic abuse, or emergency support where safety, custody, or coercive control is involved. Do not make the other person responsible for reducing the discomfort that prompted you to write.