Right of Son, Daughter in law

My father R. K Jain retired from Customs And Central Excise as Vice Chairman, one of the highest positions in India. He passed IAS and joined as an Assistant commissioner .His father S. S Jain or my grand father was a retired scientist in Rice Institute. I am the only son of my parents and an arranged marriage of me was done. I lost vision in one eye and quit working in IT in 2013. Since then my parents have been giving me an allowance of Rs. 15,000 each month. On some months it is delayed, some months they do not pay and it has been going on for last 5 years. My father is rich in assets and has properties worth over 7 crores. He also has inherited my grand father's properties who has expired along with my grand mother. I have been asking him several times for a sum of money for which I could do my own work like travel agency for example car rental. I also have been asking a flat of my own. However he has refused. I have a son and a wife whose needs are not being fulfilled like sometimes we do not have money for medical. I have attempted suicide last year due to financial woes. I also have some loans that I cannot repay as I have no job like mobile loan and instant personal loan. My wife had to resort to sell her jewellery for our personal expenses. Only once I have received a sum of 5 lakh in the year 2013 and I was taken to a lawyer where on stamp paper a number of things were written like this sum of money is for business, and then my parents said that they have added more things in the stamp paper, they did not give me any copy of this document. My life has been reduced to hell, I stay in the flat of my parents and am contemplating suicide. Can I get any share of the property. It is my grand father's earned property. My father says that I have no right on any of his property. And he hates me.