This question require Legal Property angle , Family angle too , Personal angle . This can not be solved purely as Property problem within frame of law ,due to legal complexity and restriction .
1) Whether Gift Deed properly Registered and Stamped ? Who was original owner of that House ?Please clarify? How your sister became owner ? When transcation took place which year ? Can you specify type of house that is flat /Land and structure above/ Land Record details who is land owner / Whether it is in Housing society / Municipal or local govt. tax on whose name it is ?
2) Your father has health issue check BP/Diabetes/Approach family Dr. for his health assessment. BP , Diabetes , Heart patient , Kidney Patient are aggitated people generally some time in day troubling others and also fighting , and in Marathi Chid chida. So it is health issue take care in that direction may be you get favourable results. Which Medicine he takes , may be understanding his health can also help solve problem. Give medicine name if possible -- Don't give brand name give name which is written in content of medicine and dose . So more clarity can help me to understand the problem
3) Tell your health issue also , this can also help to solve problem
4) What are your mother health issue this may be also required for solving problem and constructing matter
5) From your name I conclude you are Christian is it right ? What is your age ? Whether you have brother or sister and how many ? Any minor ? Whether you father attends Church (Church asking due to your name) ? Whether he will hear to priest (Father etc. in Church, I was in convent School , so have regards for Pries. Some time Father are strict at same time kind and helpful in certain case, Whether your dad may listen to Priest of Church) ?
6) Most important question which state ?
7) Which Course you want to pursue ? Fees for the course ?
8) What your father sister do ? How are your relationship between you and her?
After ans. to all above question will give insight to problem and tell you most favourable solution . Cr.P.C. 125 is there but your father is not working , health issue too .So doubtful.
When Problem comes in battalion and you are confused first thing maintain cool and analyise whole problem and circumstances with optimastic approach.
Sorry although legal forum still this is more personal problem and less property law probelm. but have to be solved taking all points together.