Most believers who hold to the rapture have tried to bring it up with family. Most of those conversations went badly. Not because the belief is wrong, but because the approach was.
The problem is almost never the content. It is the framing. When you lead with doctrine, people hear a lecture. When you lead with care, they hear a person who loves them.
Start with why, not what
Do not open with theology. Open with the reason you are talking at all. The reason is not that you want to be right. The reason is that you love this person and you are thinking about a future in which you might not be there.
"I have been thinking about what would happen to you if something happened to me" is a sentence anyone can hear. It does not require the listener to share your eschatology. It does not require them to believe anything at all. It is simply a person expressing love and concern, and that is a conversation most people are willing to have.
Listen more than you speak
The temptation in these conversations is to explain. To lay out the scriptural case, to address objections before they are raised, to make sure the other person understands the full picture. Resist this.
The person across from you has their own fears, their own questions, their own relationship with faith or its absence. If you spend the whole conversation talking, you will never learn what those are. And if you do not know what they are, nothing you say will land.
Ask questions. Let them tell you what they think. Let them tell you what they are afraid of. You might be surprised. Their resistance to the conversation might not be theological at all — it might be that they are frightened of losing you, and the rapture makes that fear concrete. Understanding the difference between readiness and anxiety can help you approach this gently.
Do not argue
If the conversation turns into a debate, you have already lost — not the argument, but the relationship. You are not trying to win. You are trying to be heard, and to hear.
If they disagree, let them. If they think you are wrong, that is their right. You did not come to this conversation to convert them. You came because you wanted them to know that you love them, that you have thought about their future, and that you have done something about it. Sometimes what your children need to hear from you is not a theological argument — it is simply that they matter to you.
When the conversation is not possible
Some relationships do not allow this conversation. The estrangement is too deep, the history is too painful, the other person will not sit down with you. This is where a letter does what a conversation cannot.
A letter does not require the other person's permission. It does not demand their attention in the moment. This is why writing to someone who does not share your faith is sometimes easier on paper than in person. It arrives when you are gone, when the walls between you no longer exist in the same way, and it says the thing you could never find the right moment to say out loud.
Write the letter that starts the conversation — even if the conversation itself is not possible yet.