Section 90 - Impediments of relationshipA. The following persons may not contract marriage with each other: (1) Ascendants and descendants.(2) Collaterals within the fourth degree, whether of the whole or of the half blood.B. The impediment exists whether the persons are related by consanguinity or by adoption. Nevertheless, persons related by adoption, though not by blood, in the collateral line within the fourth degree may marry each other if they obtain judicial authorization in writing to do so.Acts 1987, No. 886, §1, eff. Jan. 1, 1988; Acts 2004, No. 26, §1.Acts 1987, No. 886, §1, eff. 1/1/1988; Acts 2004, No. 26, §1.SEE ACTS 1987, NO. 886, §5.