and the father has not consented to the adoption of the child or relinquished the child for adoption, a proceeding must be brought pursuant to this chapter and a determination made of whether a parent and child relationship exists and, if so, if it should be terminated.
or if a child otherwise becomes the subject of an adoption proceeding, the agency or person to whom the child has been or is to be relinquished, or the mother or the person having custody of the child, shall file a petition in the district court to terminate the parental rights of the father, unless the father's relationship to the child has been previously terminated or determined not to exist by a court.
NRS 128.150