In the absence of an ascendant, a brother or sister, uncle or aunt, cousin or first cousin, of full age, may object only in the following two cases:
1° Where the consent of the family council, required by Article 159, has not been obtained;
2° Where the opposition is based on the alteration of the personal faculties of the future spouse ; this opposition, which the court may declare purely and simply discharged, will only ever be received on the condition that the opposing party causes or causes to be caused the opening of a legal protection measure.