SECTION II
FUNDAMENTAL RIGHTS, FREEDOMS AND DUTIES
Chapter III
FUNDAMENTAL RIGHTS AND FREEDOMS OF MAN AND CITIZEN
Article 66. Inadmissibility of testifying against relatives
No one may be forced to testify against himself or against his spouse, children, parents, or siblings. The full list of relatives against whom a person is not required to testify shall be specified by law.
Rights during investigation - self incrimination
EDIT.