Parents can execute specific POA authorising you to open the bank locker 

it should be duly notarised 

Yes, But it should be registered Power of Attorney otherwise the bank may raise objections.

Yes, if POA is registered than it can be used to operate bank lockers. If all are mentioned in details.

1. Yes, it's possible for the POA to act here in Bengaluru, on behalf of your parents, to operate Bank lockers.

2. The POA can be given to some trusted person, preferably a blood relative. The POA signed by your parents have to be notarized abroad or to be countersigned by an official of the Indian Embassy and sent to India for adjudication by the jurisdictional Sub Registrar.

The formalities to be performed in a bank to open account or locker varies with rules of every bank.  Therefore talk to the concerned branch.  Legally there is no bar.

Yes, Specific Power of Attorney along with a Letter of Authority duly signed by your mother and witnessed by your father is required to be executed in your favor for getting access to bank locker. However, Letter of Authority is to be executed every time you need access to locker. 

Specific Power of Attorney is not a form of transfer of property. Hence it provides you powers to act on behalf of your parents. Whereas the Letter of Authority is required every time you access the locker as the same signifies that you are given authority to act on their behalf on that specific day and you are authorised by them to access the locker as on that day as their POA holder. 

A set of SPOA and LOA shall be preserved by Bank for their records and the same is required to be preserved by you too. The LOA preserved by you needs sign of banker who allows you the access. 

Yes why not, can be issued mentioning bank account no., nature etc.

Hi, In the General Power of Attorney holder entitled to operate bank locker. Provided same must be mentioned in the General Power of Attorney.

A power of attorney deed is an authorisation letter to the power holder to do the assigned task on behalf of his/her principal, hence you can obtain the POA deed  for this purpose.

Even your mother and father are primary and secondary account holder, since the operative rights are vested on your mother, she can execute a notarised power of attorney deed in your favor for this purpose.

- They can execute POA in your favour and registered the same from the office of Registrar where they are residing for the said work on their behalf.