Answer Q1 - You can get these NSCs encashed at any post office. As per the guidelines, the encashment is done on the same day at the original post office, whereas it can take upto 30 working days if encashed in any other post office. Usually, at the time of encashing the NSC on maturity, the holders need to sign on the back of the certificate in front of the postmaster. You also carry Original Identity Proof such as Driver License or Passport etc.

Answer Q2 & 3 - Usually, at the time of encashing the NSC on maturity, the holders need to sign on the back of the certificate in front of the postmaster. As your brother is outside India, you cannot encash his NSC.