I am the only son of My father who died after prolonged illness in July 2013. I used to stay outside

I am the only son of My father who died after prolonged illness in July 2013. I used to stay outside due to work, but father confessed me that my mother & sister had tried to make a will / gift deed before a year & that I had recorded on my mobile. My father was paralyzed & was not able to sign for several years. Now the duo are not allowing me to enter the house & didn't allow me to do his last rites under Hindu law. They even didn't inform me after my father's death. Now my question is - How can I enter into the house? I have made a GD already in police, they said that there is an way to get court order to get entry with the help of police instantly. How to obtain the court order? Is it issued instantly?