A grandparent can file a custody petition or guardianship petition to lawfully obtain status. However, without far more facts, any other answer is not appropriate. I know this is not the answer that you are looking for, but I believe that you will need to obtain a consultation with an attorney to further explore the specific circumstances behind your question.
I truly wish you the best.
If you find my answer helpful, please click the ‘thumbs-up’ tab below. Thank you.
This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. Laws vary widely from state to state. You should rely only on the advice given to you during a personal consultation by a local attorney who is thoroughly familiar with state laws and the area of practice in which your concern lies. In the event that you have follow up questions, please post them directly on this site. This does not create an attorney-client relationship and the attorney does not read unsolicited emails. Thank You.