Clarify the agreement that existed
Identify the promise, policy, schedule, ownership, or shared understanding that applies before assigning blame. For a message about how to set a family boundary about politics, use this factual base: identify the visit, topic, money, photo, event, care task, or comment that needs a limit.
Resolve the next dependency
State what is complete, what remains disputed, and which action would move the situation forward. 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.
Document without threatening
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. Keep a factual record and describe only remedies you are entitled and prepared to use.