Enligt Portugals invandring och gränser (SEF ) , det är inte nödvändigt när barnet reser med en av sina föräldrar (läggs till mina betoning):
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.