Civil Code, Art. 1335

There is violence when in order to wrest consent, serious or irresistible force is employed. There is intimidation when one of the contracting parties is compelled by a reasonable and well-grounded fear of an imminent and grave evil upon his person or property, or upon the person or property of his spouse, descendants or ascendants, to give his consent. To determine the degree of intimidation, the age, sex and condition of the person shall be borne in mind. A threat to enforce one's claim through competent authority, if the claim is just or legal, does not vitiate consent. (1267a)