Widowed Daughter asking for share in my Father's Property

Hi, I am 63 year old male, residing in my fathers property in Chennai. My father died in the year 2010 and my mother died in 2015. Both did not left a will. I am residing in my fathers property along with my 2 younger brothers who are occupying their own house in the same compound. This property is in my fathers name, but myself and my brothers actually put money to purchase it. My Elder sister, who is widowed now. She is claiming around 1/4 share of the total property. Does she eligible for that much of share? Can you suggest on this? Also she is asking share on the rent Below are details of the property and other assets of my father. 1 House which we currently reside which is in the name of my father. (But partially we have put money to purchase this house)We have a proof of IT copy in which we denoted the share of amount which we have put to purchase the property. 2. Plot in name of my father which is ancestral property. 3. Shop in name of my father. 4. Jewels of my mother.