Can we stop taking the death certificate copy can we file a case

Me and my sister are minor i am with dob 4-8-1999 my sister is of 21-7-2007 My dady is major My mother is dead does her property will go to dady property is without will Does death certificate of my mother cause loss of our property We are against the thought of giving death certificate of my mother to dady If we give the certificate he will change all the property Our fear is that if he will get another death certificate copy by any mean we cant imagine the future of me and my sister Can we stop taking the death certificate copy can we file a case on the act of taking the property without will by my father