Start with the part that is verifiable
Separate the event you can describe from the motive or reaction you are guessing. For a message about how to reconnect with a former stepparent, use this factual base: identify the relationship, last meaningful contact, and any conflict or uncertainty that should be acknowledged.
Make one answerable request
Give the recipient one concrete question or next step instead of several emotional jobs at once. Offer one limited next step and make no response or slower contact an acceptable outcome. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Leave the recipient in control
Do not recruit relatives, use children, invoke illness, or attach an inheritance issue to emotional pressure. Respect court orders and safety plans, and use a neutral professional route for abuse, estate, or custody disputes. A clear message remains useful even when the answer is no or no answer arrives.