You would want to speak to an attorney or at least the clerk’s office.  If there is what is called a “care and protection” case with DCF involved or a CRA case, you would be filing a particular form called a “Petition for Grandparent Visitation” in Juvenile Court and most other circumstances if you were to file a Petition for Grandparent Visitation that would most likely occur in Probate and Family Court in Massachusetts.