To Mageswaran,
AS per the Transfer of property laws the immovable property acquired by your father will be equally distributed in the Class I heirs, which are all his childeren born out of Legal wedlock. i.e., yu and your brothers and sisters. Now if your father died intestate, then you need to file along with your brother sisters and Mother if alive for a Letter of administration in your state high court. It is basically an order issued by the court stating after its findings that you are the legal heirs of the immovable property and also all other movable assets in the application need to be mentioned and that you can together dispose the property or if your brothers and sisters give you release deed then you can buy it from them.
However, if your father had made a will, and the above mentioned property was bequeathed in the will then it has to be distributed only as per what was mentioned in the will. Also, the Will needs to be probated. A probate is also an order of the court. a probated will will do your work. In this case yo u will need to apply for the succession certificate to the properties of your father,
Please note, you can buy the property after the above steps.
do rite back if any further queries