The Children's Bureau is the guardian of any destitute, dependent, neglected, or delinquent child committed to the care of the Children's Bureau and shall, as soon as practicable, place the child in a private home, either temporarily or as a member of the family, and, when this action is considered proper and desirable and does not conflict with any retained legal rights of the biological parents of the child, the Children's Bureau may consent in loco parentis to the legal adoption of the child.