Dispute of property

Dear sir I am co applicant and took mortgage loan for 20 years, as my father was retired when we took loan and loan had been disbursed on the basis of my salary and earnings. we are paying loan EMI from my father account, every month EMI amount I am giving to my father cash or directly transfer to father account. Now my father is paying EMI since last 4years. Approx I have given my father nearly 15 lacs. Now my brothers and father are telling me why you have paid that EMI. And they're creating problem for me as I have lost my job and ,I came back to stay with them in the house. As I was giving EMI amount to my father and I was staying in other city as my job was in other city and I was leaving in rented house. Kindly advice me I do have any rights ob that house are not.As per valuer value of property when took the loan was nearly 10 lacs now its value is around 1 crore. And the loan we took that is for first floor construction. And we have constructed first floor. I dont have any bank paper copy with me and what are the documents I have signed at the time of taking loan. Kindly advise what can I do to stay peacefully In first floor in this house and can I get back EMI amount in future when property will be sold out by father or my brothers . Regards