Grandparents Raising Children Support Group
This community is dedicated to grandparents who are the primary caregivers of their grandchildren. In cases where the parents are not willing or able to provide adequate care for their children, grandparents may take on the role of primary caregivers. Join the support group to find support, share your experience, and get advice from other members.
I would call his bluff. Let him take you to court. As you know his chances are slim, and if he is doing drugs again he almost certainly won't follow through on his threats anyway :-)