Help! The witch said I have a fairy family.

You can believe this kind of thing or not, depending on what you think. If you believe in this kind of thing, you should worship the fairy family as the witch said. On the fifteenth day of the first month, incense is given to the old gods on holidays. If you don't believe in such things, don't think so much. You're totally scaring yourself. If you don't believe it, just ignore it and don't want to.