Land Share and debt share

Hi Sir, I am Software employee working in private company. My father has around 4 acres agriculture land. The land can fetch 1 lakh rent per year, He also getting old age pension under YSR pension in A.P. I was taking care of my father from 2008 till 2022 jan.Even I have taken care of my parent hospital bills.I purchased land and constructed house in 2017 and given for rent. My father wants that house refused told that i way pay money for rented house. I had taken care of hospital bills and i was with him. But my father forged my un-registred house documents when i was in abroad. I requested to stop him. He did not listen and proceed to get anubhandam(govt) paper. I told that that if he cheats i will stop paying him money. I payed his debts from 2008 till 2017 and cleared almost all his debts. In return he promised to register 3 acres on my name. Otherwise creditors will take over the land. My father did not listen and go ahead with cheating. Then i stopped sending money. He file police complaint on spanda. At the time i came india to settle this. I attend police station and expained they understand situation and scoded my father. After that he complained me on lok adalat. I agreed to pay 8000 as adivsed by judge and in return my father should not interfere on ancestral properties (4 acres). He did not agree for that. Judge requested to withdraw this case as he did not agree. After 3 months again my father file case in lok adalat. Same judge was there and he rejected his appeal. Then he went through different lawyer saying i thrown him out of my house. Mean while i complain spandan and MRO send notice to both to submit their evidence and enquired in this village. He took statement from previous owner who sold and they told they sold to me . after i visited 20 times. MRO tried to call and convince my father he did not listen. I again kept complaint at collector office. MRO cancelled the document he got from forged documents. I shared the documents to lawyer and the case going on. After that I came to abroad to work and my family also came with me. After we left my father again visited S.I and new SI filed section 125 cpc and submitted court. during that time also I sent money to my father with help of my nephew. He is giving money to my father. Now am in abroad. I have one year visa validity. If I need to extend my visa application will police verfication fails. Whether police can file FIR when we are in abroad. We already went police station multiple times and submitted evidence to previous C.I and S.I and they cancelled my father application. Please help me how can proceed.I need to work abroad for few year as i have disabled son. His hearing device costs around 10 lakhs.Need to save money for his future. I am not getting any benefit from govt. I do not have much money in bank. I paid my father debts and all ancestral land is with his name. I have four sisters and they are elder to me. My father kept case on me only