Is it permissible to send a five-year-old child to live with his father in another country to learn the Quran and live in an Islamic environment, and does the ruling on child custody after divorce apply to him?

If the marital relationship is ongoing, custody is a right for both parents, and the situation before divorce is not to be equated with the situation after it. The spouses should consult each other to decide what is best for the child, with an emphasis on the danger of residing in lands of disbelief.