Account for the relationship as it is now
Use a tone that fits the present relationship, not the closeness, authority, or access that existed in the past. For a message about how to tell family you are separating, use this factual base: lead with the confirmed event, what it changes, who already knows, and any practical next step.
Ask without assigning an obligation
Explain what you hope for while making decline, delay, or a different format genuinely acceptable. Say what support or decision is needed now and make clear when no response is required. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Keep the ending honest
Do not hide the central fact behind a long preface, speculate, or offer reassurance you cannot support. For death, abuse, medical emergencies, legal danger, or immediate safety risk, use qualified and urgent support first. Avoid future promises, guilt, flattery, or nostalgia that imply the recipient owes you access.