Money loaned to brother for property

I had transferred money to my brother to buy a flat in Pune. I was out of country, property was registered on his & his wife's name. I sent him almost 67% of the total flat cost. I was under the impression that I own my share in the flat. Last year I purchased a flat & got some monetary help from brother. Now he says, he'll return the principal amount to me with no interest at all & I have no claim legally on the Pune flat. He also says that the money he gave me last year to buy a property was an part of returning the original principal amount. He is willing to return the remaining principal amount. I'd like to know if I can legally ask him to return my money with some interest and/or ask for share in the Pune flat. Property has appreciated in the last 5 years. I have no legal agreement being made. Only thing I have are the bank statements of sending money to him.