2
Tell nobody. Including the group chat.
The clock on your privacy starts the moment a second person knows.
Not your brother. Not your best friend. Not the person behind the counter. Not, under any circumstances, social media.
This is not paranoia about your family. It is that the number of people who know is the number of people who can tell someone else, and the story is irresistible. Once it is out, it does not go back in, and everything downstream — where you live, whether your children get approached, how many long-lost relatives materialise — is decided by it.
Your spouse or partner is the standard exception, and even there, a fortnight of two people knowing is a very different situation from a fortnight of nine.