Your question involves something of a false premise -- there are basically no "rights" for either natural OR step-grandparents when it comes to visitation with minor children. Either voluntary arrangements can be made through one or the other natural parents; if there has been a death or divorce, the process is a tenuous and difficult one to secure visitation over objection. See the statute, discussion, and resources posted at http://willicklawgroup.com/child-custody-and-visitation/.
If both parents refuse, it may be impossible to overcome the objection. If you have other questions, you may wish to consider conferring with a family law specialist.
Answered on Sep 11th, 2014 at 11:32 AM