Electricitybill_not paid

My father has a  home  in my home town in which one my cousin along with his wife and kids stay and we don't have a rent agreement between us. I have just discovered that he has not paid any electricity bills for the last 2 yrs. I have tried to use all means of making him understand politely but he has been just fooling me around for more than few months. Can you tell me what legal recourses i have.

a) Whether its a civil or criminal case.

b) Do i need to file a complaint in police or court.

c) Whether absence of rent agreement hamper me or weaken my case.

d) The house is big and there is another tenant who stays and he pays the bills on time ( There are 2 meters) .

e) The other tenant is truthhful and is on my side. Will it help.

f) Is it the best idea to file a complaint in police or lodge a case ? Please suggest any other options that i have.