The Form 4506-T has to be signed by the taxpayer or his/her authorized representative. I do not think this will help you.
Typically the best way to get to income (and perhaps ability to pay) is through normal court discovery procedures -- interrogatories, production of documents, perhaps a deposition -- but it depends on the situation.
You need local counsel to be involved and help evaluate your strategy, goals, resources, and history to really get a proper answer.
This answer or response should not be considered legal advice, and does not create an attorney-client relationship. If you have further questions, I would be glad to discuss your situation further. I can be reached at US - (801) 746-6300, or online at -- http://www.lewishansen.com/attorneys/robinson.html
Not very much will happen until you hire an attorney to start the legal discovery process.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.