Womens rights in grand fathers / fathers property

Dear Sir,

 My Grandfather has two wifes. Both are legal. Elder one has only one son. He is the big father for our family 

 Younger wife has four children (My father, Two aunty and periyappa) My father and both the aunty are deaf and dumb and my periyappa is mentally disordered and he has no children and he has died also. Only his uneducated wife is still survive.

 According to me, my Grandfather has the property of One Shop of around 2000 sq ft and Three houses at Salem Tamilnadu. The property value around 3 crores. As our father is helpless my Big father has given only one house for both  my father and periyappa as FINAL settlement and informed us that we don’t have any rights in the shop or any other houses.

 For our father we are four children Two daughters and Two Sons. My fathers house both the brothers shared among themselves without informing us and they are telling I have no share in the property.

Pls advise on the following.

1. Whether I am having rights in my BIG FATHER as well as in my fathers property.

2. I am not having copy of any of the documents. I know only my house address. Based on this is it possible to get copy of the document from registrar office?

3. Is it possible for me to file a case against my BIG Fathers property as a single member as our family members are not ready to support me  in filing a case against my BIG Fathers property

4. What will be the court fee invloved to take up the case. I am from low middleclass and hence I need to calculate approx amt that could be involved in filing a case.

5. Any exemption can be availed for court fee. ( Property is in Salem and I am staying at Bangalore)

Pls advise.

Kala