Yes, if you earn an income, you have to pay taxes. You lost your right to vote because you violated the law. That does not give you a free pass to violate a different law.
Yes it is legal for the government to collect taxes in that situation.
You do have political representation, you just lost your right to vote for your choice of representation.
It is not taxation without representation.
There is something called the "litigation privilege" but it does not apply to the facts you set forth.
If a person denies a fact in responding to a request for admission, then that is their response. If you have evidence to prove the denial is false, then you will be able to use that evidence to impeach the person at trial, or to establish the elements of your claims.
If they were negligent in allowing the money to be withdrawn, then yes, the insurance company could be held liable. You need to speak with an attorney that handles insurance cases. You also need to contact the police about the identity theft.
If you are talking about giving testimony in trial or at deposition, the attorney is allowed to ask you questions. You cannot cross-examine the attorney. You can ask him questions, but he does not have to answer.
If you are a party, you can ask the petitioner questions.
As for finding an attorney that might be willing to represent you on a limited basis, use the AVVO find a lawyer feature and look for family law attorneys.
Service at the wrong address, even though the right party eventually got the papers, will not be considered proper service.
Contact the process server, let them know they got it wrong and try to get them to go out again. They should be willing to do it again until they get it right.
If you don't show up, the court can treat the request as if it is unopposed and grant her everything she is asking. Try and get some help. There is legal aid available, and organizations that help with family law cases. Even if you don't get help, you still should show up and explain why your visits should not be shortened, and why you should not be responsible for her fees. If you don't show up you could end up owing even more.
Use the AVVO find a lawyer link and look for an Elder Law or Elder Abuse attorney in your area. Many attorneys will take cases on a contingency basis when there is the likelihood of some money being recovered. Finding a pro-bono attorney - or one that is willing to represent your father for no fee at all - is a bit more challenging.