An amendment to the law in Portugal, which entered into force July 2018, makes it easier for the spouse to obtain Portuguese citizenship.
According to this, In cases where a Portuguese citizen has a Portuguese child, the other parent can obtain Portuguese citizenship without proving an additional special connection to Portugal. The existence of a Portuguese child and spouse are sufficient. It is not obligatory that the common child is a minor. From our acquaintance with the families that apply for and obtain Portuguese citizenship, this amendment is quite meaningful. Now, the spouse can obtain Portuguese citizenship quite easily, once the spouse and child are Portuguese.