Yes, if the person has full power of attorney and the person who gave it is not able to take care of their personal business.
The father is responsible for filing the return. One of the reasons someone appoints a power of attorney is to take care of such things.
A collection attorney has many tasks that they perform. A collection attorney is responsible to contact those responsible of owing money to someone or a company, and working on how that person will pay the money. After how is worked out, the collection attorney keeps track of the payments and if any are missed, will visit or contact the person.
The court will appoint someone as executor. They often use a bank or attorney to handle the matters.
The word disgruntled means dissatisfied, discontented, or upset, and is notably used for a disgruntled ex-employee, to mean someone who feels misused and may still harbor ill will against a previous employer.
The fact that you hold someone's power of attorney does not make you legally responsible for their actions. You are legally responsible for your own actions, of course. If as part of a settlement for the car accident you were supposed to issue a payment from an account of theirs that you have power of attorney over and you don't, you could both be in trouble over that, but the car accident itself would not be your fault.
The power of attorney ends with the death of the grantor. Someone will open an estate in order to settle the debts.
describing what someone is doing and thinking
Not legally. A power of attorney represents a living person. After their death, the will and its appointed executor are responsible.
Anyone can act as a power of attorney for someone else. You do not have to be an attorney
It does not make sense that someone would have to pay an attorney tax. If someone needs the counsel of a tax attorney, that is another matter. A tax attorney handles issues around tax and the IRS.
Misused means something used incorrectly or someone treated unfairly.
You should seek the advice of an attorney.