Ancestral property

As to what's within my knowledge, as the rightful heir, you can indeed file a suit for partition in the nearest district court to obtain your share of the ancestral property (i.e. 1/3 share, assuming you, your father, and your sister are the only surviving memebers.)

Since it is ancestral property, if you are Hindus, the property will be divided into three parts.  One is for your father and one is for your sister and one part is for you.  You can file Partition suit.  You can ask the court to deposit the rents into the court.  You can take your 1/3rd rent from the court on filing Interim Application before the court.  

From the facts stated, the property does not appear to be ancestral; you have no right or share in the property during your father's lifetime. 

can you kindly clarify as to why it does not come under ancestral property ?//

Ancestral property is property inherited upto 4 generations of male lineage (i.e., father, grand father, etc.) Your right to a share in such property rises from the moment you are born. P Venu may be incorrect in his assumption. Nonetheless, it'd prove prudent if you get in touch with a local lawyer so he or she can assist you through the matter smoothly.