Will my wife face criminal charges and could her parents as well?

She will not face criminal charges, as it is not a crime to move with your own child unless there is a court order in place that prohibits the move (she may have violated orders as to your step child, and that should be looked into as you might find an ally in that child's father). However, you can file an emergency motion to have your child returned to Nevada as Nevada continues to have jurisdiction over the child so long as the child was here 6 months and has not been in Louisiana 6 months yet. This could by tricky for you if you do not presently live in Nevada, which your question seems to imply. If you left Nevada, and left your child in your wife's custody in Nevada, you could be found to have abandoned your child. This would work against you in a custody dispute. It is obvious that your situation is complex and has legal technicalities that cannot be figured out in this forum. You should be asking your current attorney these questions, as that is the person most knowledgeable of your case.