You have choice of lodging complaint against him with police for threats of committing suicide.
Next steps you may lodge him in old age house.
We are law abiding citizens and parents are our pride in Society.
Apart from above two steps which is allowed under the provisions of law, No third step is allowed under the law.
Hooliganism, torture, threats, criminal acts,thrashing,blackmailing etc are not the acts of law abiding citizens and I would never advice you to resort to such ways of setting your father right on track of life.
Follow up is the duty of concerned officers to take next steps if matter doesn't appear to be improved.