Maternal Property Question!!

My maternal grandfather had Three (3) daughters and no sons. I am the son of the second daughter. My grandparents expired in the 2005 and 2006. Both my aunts took posession of his house and all his asset's including 13 acres of farm land and not willing to partition the property and give the share to my mother. My grandfather has registered both the house property to one the eldest daughter son. My grand mother registered the farm land to the third daughter son. They are also claiming that there is a will written by both grand father and grand mother but not willing to share any documents or will copies. They do not want to give any share either to my mother or me.I have one younger brother and sister. All the relevant documents about the property are with my aunts and I don't have any documents. Under these circumstances, will it be possible for me to file a partition suit and claim my share of the property? All the properties are situated in Andhra Pradesh. Please advice.