Divorce after 6 years of marriage

Dear all, I'm currently going through an emotional turmoil and wish to seek your advice on divorce laws according to Hindu Marriage Act. I've been married for 6 years and not a month has passed by without issues. Both of us have finally decided to part our ways but the catch here is that my wife is trying to take an advantage of my situation where my sister is currently staying with us and she is also going through a divorce case since the last 2 years. She is using my sister to threaten us that she will drag her to court claiming that she is the reason for the divorce. Off late, I can sense that they may be ready for a mutual agreement but I'm sure they will demand something big, monetarily. I'm currently an employee of an IT staffing company and have a salary package of 9 lakhs per annum. I've applied for a home loan which has got approved and the loan amount is 25 lakhs for 20 years, EMI around 22500. Below are my concerns where I need some suggestions: 1. The property is on the name of my father. Can she make a claim on it since I have take a home loan to build a house? The registry will be on my fathers name only. My dad is a retired govt employee and gets a monthly pension of 22000. 2. In case they file a case, what is the alimony amount I may have to pay considering I don't have kids and that also have a loan to take care of. My wife works for a school and earns approximately 7-10k per month, not sure about the exact amount. I stay at Jaipur and my wife has moved to Delhi recently. I'm sure that they would be looking to remarry her soon after the divorce. 3. How can I safeguard my sister who is already going through a divorce case in case she is dragged into the case. Its purely a case of using someone's shoulder to fire since my sister has nothing to do with the issues me and my wife have with each other. She has only been living with me and my parents for the last couple of years and my issues with my wife started from the first year itself 4. In case they agree to mutually get a divorce and ask for a one time payment, do I agree to pay them based on my financial status or let them file a case against me. I guarantee that they wont be able to prove a thing even if they charge me for DV or under 498A since I have done nothing wrong. Thanks and I look forward to some responses since I am absolutely clueless.