after my dad passed away, i found out my brother had a will and trust set up. then he got power of attorney. the attorney will not provide me copies

The power of attorney lapsed when your father died.  It has no bearing on what happens after your father's death.  The successor trustee (assuming your dad was trustee of his trust while he was alive) is required to give you a copy of the trust if you ask for it; you say he has done that.  Unless you believe the agent under your father's power of attorney exceeded his or her authority (during your father's lifetime), there is nothing to be gained by viewing the document.