capital gains tax for senior citizens

Dear Sir, I am Chetan Phatak, from Aurangabad. I need your advice regarding the capital gains tax for my father (age 81 years) who is senior citizen. My father’s property is in Nagpur which he purchased for @3.0 Lakh in the year 2003. Due to some medical reasons, and there is no one to take care of them, I brought my parents to Aurangabad so that I can take care of them. Now I have purchased one flat for them in the same apartment of mine. As you know, he is a senior citizen, he can not avail home loan facility. So I have taken home loan to purchase the property for him and now my parents are living there. I have taken the home loan of Rs.20,70,000=00. Now I want to sale my father’s flat of Nagpur and use this money to repay my home loan. We have got the offer price of @21 Lakhs now. Please guide me how this can be possible? I am regularly paying my income tax returns. Whether my father or me are liable to pay capital gain tax for the property sale in Nagpur. or is there any way out to avoid the tax? Please guide me. Kind regards, Chetan Phatak