I'm not married yet, and my brother borrowed money from me. Do you want to return it later?

If you don't have a married brother, do you want to pay back the borrowed money? Why don't you ask your brother to write an iou and pay it back later? Of course, if the money is very small, 100 200, then you don't have to pay it back. If it is tens of thousands, it must be returned. If you don't pay it back, it will be bad in the future. If you do this, you will still maintain good relations with your brothers and sisters.

Of course, it also depends on your family. It would be easy if the financial details of the family were clear. If all the finances in the family are often mixed together, it will be difficult for both you and me to handle this matter well. Don't give it back, not even to your brother.