The lawfully adopted child shall not be considered an heir of his biological parent unless the decree of adoption provides for the continuation of inheritance rights. This provision shall not prevent a biological parent from giving or devising property to his adopted child by will. A child who has been cared for, or considered adopted by custom, but not by law, shall remain an heir of his biological parents. [Res. 06-R-53 § 5.2, 5/3/2006.]