Is your father alive ? If not, then you have to show, certificate of death, proof that you reside in the same address as your mother, her bank account statement with no activity for at least one year, proof of relationship to her, anything that shows she is dependent on you for her expenses etc.
Yes my father is no more. I and my wife stay and take care of her.
A follow question regarding "her bank account statement with no activity for at least one year"
1. Is this a mandatory document to be submitted? Can we do without?
Its impossible to have no account activity in a bank account- Interests from saving keep falling, there will be withdrawals and deposits.
2. Will I be required to submit my mother's Income Tax filed papers?