Statutory period and right to dispute validity and terms of irrevocable trust depend on information not provided . You have not provided...

Lack of signature is enormous red flag. Your attorney may file objections and appropriate probate petition on your behalf.

Possibly. Your rights and surviving spouse right governed by AZ probate code, whether mother has valid Will, Trust, no estate plan. You have not...

Yes. You have legal right to copy of the trust and accounting from brother (successor trustee. Retain counsel to begin by making written demand...

No. Non-principal may not unilaterally appoint self POA for another person. Your question raises other serious issues which should be personally...

Possibly. POA drafted in CA is valid in NV as log as it complies with either CA or NV requirements at date it is drafted.

Review your situation with your attorney and seek second opinion with another attorney for possible substitution into matter on your behalf

Possibly. Check retainer agreement for terms governing rights to withdraw and survival of contingency fees.

Yes. Judge may order Debtors Examination to be held at opposing counsel office.....................

It is you responsibility to file Order and Notice or Order of DWOP. Your attorney should file Order and Notice of DWOP.