Legal Question in Family Law in Nevada

It is unlikely that a guardian can keep a voluntary guardianship if the parent wants custody back. In Nevada we have a parental preference law in the guardianship statutes. Your best bet is to either push for voluntary adoption or relinquish custody in exchange for grandparent visitation rights being placed in the termination order.

In my opinion, there is not enough information provided to evaluate the question that you ask.

The parental preference doctrine has been found inapplicable in situations where a grandparent has been found to be a child's legal (de jure) custodian, and it might be likewise in a situation where a grandparent has been an actual (de facto) custodian of long-standing. Much depends on the fitness of the natural parents, then and now.

For the legal background, including links to the statute governing grandparental child custody and visitation, see http://www.willicklawgroup.com/child_custody_visitation.