This Part IV of this subtitle:
(1) may not be construed to restrict or alter the authority of any public or private agency or institution that deals with out–of–home placement, adoption, or related matters; and
(2) is related to and should be read in relation to Subtitle 13 of this title and §§ 5–524, 5–525, 5–525.1, and 5–534 of this subtitle.