This situation is exactly what the power of attorney is for. It is a written document which gives others control over your personal affairs if you are unable to do so in case of injury or other incident.
You and get would have to go to the court house anand sign paperwork.
If your mother grants you the power of attorney. Otherwise it will require a court order.
The right to complain to your father.
People can dispute whatever they want. But, assuming the power of attorney was for you if you become incapacitated or incompetent and named your mother as your power of attorney in that instance, she'll lose if she disputes it. You can name whomever you want as your power of attorney and no judge anywhere would rule otherwise.
No. A Power of Attorney expires immediately upon the death of the principal or the attorney-in-fact unless the Power of Attorney document provides for a named successor.
The POA becomes invalid when a person dies.
In most cases it is possible. Unless there are restrictions in the power of attorney document.
You must be a court appointed guardian to over-ride your mother's decisions. A Power of Attorney does not give you that type of authority.
Your brother cannot be the 'power of attorney' for your mother's estate. A Power of attorney is extinguished upon the death of the principal. If your mother has died then your brother has no more authority over her property. In order to obtain the legal right to manage her estate you must apply to the probate court for appointment as the personal representative of her estate.
Only if you have your mother's power of attorney may you pick up your mother's pension.
It would depend on the wording of the power of attorney. In such cases, a limited power of attorney should have been granted, specifically restricted to opening a bank account.
No you do not. The next person in the list on your Grandmother's trust document steps in as the successor trustee. Powers of attorney are invalid once the principal has died. Your mother's Power of Attorney (which has expired) has nothing to do with your Grandmother's trust.