1. If the first loan is more than 2 years away from the agreed repayment time, you can claim to request the court to reject the other party's request exceeding the limitation of action;

2. Follow-up IOUs should also be signed by you. Without your signature, you can't admit that you have no repayment obligation.

1. Your brother's first loan:

(1) You were there when you used your ID card. You said, "I don't remember if you signed it at that time.". It is very likely that you signed the IOU at that time, otherwise the credit union would not come to your house to find you.

(2) If you signed the loan contract, this is the money you borrowed. If your brother doesn't pay back, the credit union will ask you to pay back and sue you in court.

(3) If you just borrowed your ID card and didn't sign a loan contract at that time, you can refuse to admit that you have been to your home, or you can refuse to admit that this is your loan and let the credit union go to court. Credit cooperatives have to provide evidence to prove that you were there and signed a loan contract before they can get the support of the court. Otherwise, the credit union's own review of the loan does not meet the procedures and can't find you.

2. Your brother's other funds: when transferred to your name, you will not be responsible without your signature.

The key now is: first of all, you should find out whether the original loan contract was signed by you and whether the subsequent loans were transferred to your name. If you find out the situation, you can decide what to do: whether to repay according to law and find evidence to recover from your brother, or not to admit or agree to repay.