I don't think that is going to matter as you show your nata things only during interview. They are not submitted with your other documents that you submit during application. So I don't think that they keep record of these documents. But in my personal opinion it will be very hard for your brother to obtain a visa at this age. They will grant visa for your dad and mom but it will be very hard to convince them that your brother will be returning back to Nepal. Good luck.