Firslty, we have to see the nature of property as to whether it is the anscestral one or self acquired.
Secondly, if it is the self acquired then it will go as per the Succession law to all the legal heirs in the absence of any will.
Thirdly, and if they saying that they have will then I advice you to file suit for partition as Hindu Succession Act then it would be clear as to whether they have any will or not.
Fourthly, now, if the property is anscestral one then it would divide as per Law of Inheritance, and would be divided equally amongst you all.
Fifthly, here also you will have to file a suit for partition as per Law if Inheritance.
Sixthly, but, for both the process you first have to get the succession certificate from the civil court to claim your right.
Rest you are free to contact me through Kaanoon for getting your chart of each persons share in the property in both the cases.