Article 18 — — Opposition by whom Made.

Opposition to the conclusion of marriage shall be made only by the following persons: (a) In case of age, by the parents of the minor, public prosecutor or any other interested person; (b) In case of relationship by consanguinity or affinity, by the ascendants of the future spouses, or the ascendants of one of them, or by the brothers or sisters of the future spouses, who have attained the age of eighteen years or by the public prosecutor; (c) In case of bigamy, by the person alleging to have had a prior marital relationship with the bigamous spouse or by the public prosecutor; (d) In case of judicial interdiction, by his guardian, or by the public prosecutor.