This query was running since 2013 and in that query, you have replied that you are residing separately and your father is having bank interest as steady income and as to whether your father can attach your salary towards maintenance, etc (All this after borrowing from him in 2012). Who is the owner of that house in which you are residing? If you are having ancestral property and some nucleus came from that joint property/ancestral property, irrespective of such quantum the property belongs to joint family property. Once the son lives separately and is not connected it is enough and this was your position as on 2013., How can you disown the father's relationship legally now when it is you who brought him to your house when he is living separately. How he secured that income for lending it to you for the purchase of your house?. Everyone thinks that he is a good player and plays their cards thinking that they are wise and you might have considered your father aged 75years as a burden on you and not willing to pay even maintenance in 2013 and now wanted to repay the money even when he is not demanding and now you wanted to disown him after living separately in 2013.
Your father was living separately in 2013. He was having a steady income then. He has even lent some money in 2012 and you have availed a bank loan for the purchase of a house and expressed tonnes of difficulties in 2013. Then you have doubted that your father may demand maintenance from you. In 2021 you raised a new issue of marital disputes to disown him after bringing him to your house and prepared to pay the amount lent by him to disown him ?
Contact a local advocate as discussing certain facts is not proper in an open forum.