Dividing the will

Sir,my grand father had two sons.he made the WILL unregistered and gave it to elder son with angry over younger son(my father),because of conflict between my father and mother.But few days after will submission,my parents compromised and lived together without going up to legal proceedings of division between them. my grand pa had three son - in- laws where two are sons of elder son and myself to younger son.one of the son of elder one died before my grand pa death.The WILL was unchanged.In 2010,one of the property of my grandpa's was divided between my self and my remained cousin when I am minor and my grandpa is still alive .The will writer for my grand pa is the same person who divided this property said to my father to bring me even I am minor but my father don't know anything of will .During the last days of my grand pa's death, he said to my father to divide entire property before his death.But my grand pa didn't told anything about the will to my father but,he always says to my father to divide.My grand pa died later.Now, when the remaining property was dividing,my cousin as well as his father is saying there is a will but they didn't revealed where it was and what is in it?.No problem if written for son-in- laws but My tension is if entire property was written to my cousin or uncle(my father's elder brother) with angry over my father by my grand pa,is there any solution to divide it equally? Please tell all possible ways to get divided equally.