My grandsons mother and I want me to have grandparents visitation

Grandparent's rights are derivative of the parent's rights. From the way I read your question, you want to see your grandson, but it is your son who has issues. If that is true, you may need to have the mother apply to grant you grandparent's visitation rights. But this seems to involve many other issues. If it is the child who is showing the signs of mental distress you describe, then it is more than likely that a court would have to schedule a psychiatric evaluation to see whether the child is safe in the current location. It may also involve having the Division of Child Protection and Permanency get involved.