Sister in Law (Bhabhi) as Joint Owner instead of Wife

I will post this question in a timeline manner. 1976- 1. Property purchased by Mr. Vijay for Rs. 35,000 in Mumbai vide 2 cheques of Rs. 28,000 & Rs. 7,000 paid from his personal account of Bank of Baroda. Both the cheques details find mention in original agreement. 2. Mr. Vijay names Mrs. Vidya (his brother's wife as Joint Owner) in the original agreement. Property possessed by Late Mrs. Vidya & her family since Day 1 till date. 1984- 1. Mrs. Vidya dies and Mr. Vijay claims FULL possession as he is the survivor joint owner. Mr. Vijay also mentions that he wrote Mrs. Vidya's name out of love and affection as she had taken care of him as a son. However, Mr. Raju, son of Mrs. Vidya claims ownership as per succession after his mother's death and does not vacate. He also claims that Mr. Vijay's name on the original agreement was put by fraud, however we prove it very easily that the payments have gone from his personal account so there's no question of fraud. 2. Court case begins 1992- 1. Mr. Vijay dies intestate leaving his son Mr. Jay who follows the court case at Co Operative Society Court. Questions- 1. What are Mr. Jay's right now and what relief can Mr. Jay seek from the Court? The court has accepted the jurisdiction so request you not to comment on the jurisdiction of the Co Op Court. This matter is pending since ages as you can see, please do help as Co Op advocates aren't really useful.