Louisiana Revised Statutes Tit. 9, § 461. Effect of adult adoption by stepparent

In an adoption in accordance with the first paragraph of Civil Code Article 212, if the adoptive parent is married to a parent of the adopted child at the time of the adoption or was married to a parent at the time of the death of the parent, the relationship of that parent and his relatives to the adopted child shall remain unaltered and unaffected by the adoption.