Louisiana Revised Statutes Tit. 9, § 391.1. Child conceived after death of parent

A. Notwithstanding the provisions of any law to the contrary, any child conceived after the death of a decedent, who specifically authorized in writing his surviving spouse to use his gametes, shall be deemed the child of such decedent with all rights, including the capacity to inherit from the decedent, as the child would have had if the child had been in existence at the time of the death of the deceased parent, provided the child was born to the surviving spouse, using the gametes of the decedent, within three years of the death of the decedent.

B. Any heir or legatee of the decedent whose interest in the succession of the decedent will be reduced by the birth of a child conceived as provided in Subsection A of this Section shall have one year from the birth of such child within which to bring an action to disavow paternity.