The mere fact that a foreign child custody order is homologized in Brazil does not guarantee that the order will remain in effect and unchanged over time.

Brazilian courts will have jurisdiction to hear an application to modify any such order once the child has relocated to and is resident in Brazil.

Under Brazilian law, child custody orders are not final orders and are always subject to modification whenever a court finds that there has been a change in family circumstances.

See https://www.international-divorce.com/child-relocation-to-brazil-mirror-orders-and-homologized-orders