1. A nomination in banking terms refers to an account holder's right to appoint one or more persons who are entitled to receive the money in case of the death of the account holder.
Nominee is a mere custodian of the fixed deposit. He is the contact person for the account, in case the account holder is not reachable or in an event of the account holders death.
Thus a nominee should intimate about the death of the account holder with a copy of the death certificate and fill up the claim form to claim the amount lying in his various accounts to which he or she has been nominated by the deceased account holder.
2. Nominee cannot withdraw the amount during the lifetime of the account holder.
3. No.
4. The nominee cannot withdraw the amount from the account holder's account during his lifetime, if he or she does so then she or he would not have done in the capacity of a nominee but as the account holder himself/herself itself, by forging the signature of the account holder, it is a criminal offence for cheating, breach of trust, misappropriation and other offences.
5. If you don't trust the integrity of the nominee, then cancel the nomination in writing and appoint a different and trustworthy nominee.