Only spouse is heir

(N) No. When there are no brothers and sisters

In this case, it means that there are no heirs of the first and second rank.

Only the spouse will be the heir.

Set out in Civil Law Article 890

The spouse of a decedent shall always be an heir. In this case, if there is a person to become an heir pursuant to the provisions of Article 887 or the preceding Articlethe spouse shall be of the same rank as that  person.

Next, usually you will consider the question of will.