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.
La. R.S. § 9:461
See Acts 1988, No. 124, §3.