What are the rulings concerning the details of حضانة (custody) after divorce from the first wife, and its ruling if she marries another man, and what are the conditions for the relationship with her within the bounds of the children's best interest, and what are the شرعية (Sharia-compliant) rulings and regulations in the event that one or both of the divorced spouses travel to other countries with regard to حضانة (custody) and رؤية (visitation)?

The fundamental principle of custody is that it belongs to the mother as long as she does not remarry. If she remarries, custody transfers to the person most deserving of it. It is not permissible for a divorced woman to speak with her ex-husband except for a necessity related to the children's welfare, while adhering to Sharia guidelines and assessing the necessity appropriately without softness in speech. Both parents have the right to see the child in custody, whether during travel or residency, and the child's best interest should be prioritized.