Legal Question in Family Law in North Carolina

It doesn't matter whether you have a "legal letter" or a document signed by God. When it comes to custody of the children, such matters are always subject to the courts if one party or the other files a custody petition.

Child custody is based on the child's best interests. Anything and everything bearing on the child's well-being is relevant. So while you may have the letter and it may provide some evidence, nothing precludes your ex-husbande from going to court and requesting custody/visitation with the children.

Once a court order granting custody/visitation is entered, it may be modified based on a change in circumstances.