Power of Attorney

My father is in a vegetative state. My brother has power of attorney but is does not live in the united states- canada, and travels so much that he cannot be located. I am the daughter of the patient and would like the power of attorney given to me.. What needs to be done

I have a Durable Power of Attorney For Finance for My Brother, that was developed using Legal Zoom. Article II states This Power of Attorney shall become effective upon my disability and shall survive and continue during my disability, incompetence, incapacity, or partial incapacity, etc. Article III states' The successor Agent shall be entitled to act upon the DEATH, disability, etc.' Article IV states 'My agent shall have all powers of an ABSOLUTE OWNER over my assets and liabilities -- within or without the State of FL, WITHOUT LIMITATION etc.' -- My Brother passed away and now the bank and Legal Zoom customer service advises that this power of attorney ceases at death. Can this be true, given the above Article specifics ?

I have a Durable Power of Attorney for my mother. She has been declared incompetent since granting me power of attorney. She did not name a successor. What would happen if I reliquished my Power of Attorney at this point?

My mother-in-law in PA is 85 and had her oldest son set up as power of attorney and executor. Both are having health problems now. Is there any legal way to have another son/daughter take over as power of attorney or executor? The mother's lawyer has said that there isn't. The eldest son has just started dialysis and also has vision problems.

can my original power of attorney be changed or contested by the person i originally gave power of attorney to