A child accompanying or following-to-join the self-petitioning spouse may be accorded the same preference and priority date as the self-petitioner without the necessity of a separate petition, if the child has not been classified as an immigrant based on his or her own self-petition. A derivative child who had been included in a parent's self-petition may later file a self-petition, provided the child meets the self-petitioning requirements. A child who has been classified as an immigrant based on a petition filed by the abuser or another relative may also be derivatively included in a parent's self-petition. The derivative child must be unmarried, less than 21 years old, and otherwise qualify as the self-petitioner's child under section 101(b)(1)(F) of the Act until he or she becomes a lawful permanent resident based on the derivative classification.