3. Collaterals by legitimate affinity up to the fourth degree.
4. Collaterals by natural consanguinity or affinity up to the second degree.
The government, for sufficient cause, may on the petition of a party grant a dispensation permitting a marriage of minors who have not obtained the proper permission or advice of the persons whose legal right it is to authorize one or the other.
For grave reasons the government may also grant a dispensation relieving a party from the prohibition of marrying within the third and fourth degrees of collaterals by legitimate consanguinity; the impediments arising from legitimate or natural affinity between collaterals and those relating to the descendants of the adopter.
Special Prohibitions.—The following persons cannot contract marriage with each other:
1. The adopting father or mother and the adopted; the latter and the surviving spouse of the former, and the former and the surviving spouse of the latter.
2. The legitimate descendants of the adopter with the adopted, while the adoption lasts.
3. Adulterers who have been condemned by a final judgment.
4. Those who have been condemned as authors, or as the author and accomplice, of the death of the spouse of either of them.
Celebration of Marriage.—A civil marriage must be celebrated according to the requirements of the code, as changed or modified by subsequent orders, decrees and legislation.