De acordo com o Serviço de Imigração e Fronteiras de Portugal (SEF ) , não é necessário quando a criança está viajando com um de seus pais (com ênfase adicionada):
Minor, whose parents are married (to one another)
The travel permit must be granted and signed by one of the parents, only if the child is travelling without either of them; in cases where the child is travelling in the company of one parent, no permit is required, provided there is no opposition by the other parent.