Can my ex husband's parents seek visitation rights from me?

There is no explicit case on point, but on your facts, I think the statute would prevent them from invading your time. NRS 125C.050 governs grandparent visitation cases; while it speaks in terms of "a parent" having denied visitation, it requires that visitation has been "denied or unreasonably restricted" as a basis for even ASKING for such visitation.  If they are getting contact during dad's time, it would seem to me that they do not have a valid basis for complaint.  At least that is how the judges have ruled in the cases I am familiar with. For the grandparent's cases, statutes, etc., see the explanation, materials, and links posted on our Child Custody page: http://willicklawgroup.com/child-custody-and-visitation/ If you need further assistance, of course, you should consult with a knowledgeable family law specialist.