spouse, no children, and linear ascendant

(Y) Yes. The deceased had lineal ascendant

It means that  a spouse and lineal ascendant are heirs.

Article 889 of the Civil Code (Right of Inheritance of Lineal Ascendant and Sibling)

(1) In the case where there is no person to become an heir pursuant to the provisions of Article 887, the following personshall become heirs in accordance with the following order of rank :

(i) lineal ascendants of the decedent :  providethat between persons of differing degree of kinshipthe person who is of closer relationship shall have higher priority of inheritance;

(ii) siblings of the decedent.

The provisions of Article 887, paragraph (2) shall apply mutatis mutandis to the case of item (ii) of the preceding paragraph.

(2) If a decedent‘s child has died before the commencement of inheritanceor has lost the right to inheritance by application of the provisions of Article 891 or disinheritance, the child of the decedent‘s child shall be an heir as an heir per stirpes; providethat this shall not apply if the child is not a lineal descendant of the decedent.

The legal inheritance is 2/3 for spouses and 1/3 for all lineal ascendant.