1. You should have taken legal advise before contacting the Bank and making payment,
2. The Bank's claim is restricted on your brother only and not on yourselves,
3. You are unnecessarily worrying yourself by thinking that the liability of repayment will be burdened on you,
4. Please note that since your house has not been mortgaged, the Bank can not take any legal action on you or attach your house,
5. Let the Bank take legal action on your brother, if he is not interested to repay the said loan,
6. However, if he makes any one time settlement, he should collect a letter signed by the Branch Manager in his presence stating that there will be no more dues from him if he pays the settled amount.