I need help understanding wills and trusts.

Thanks for your response. No I never received a distribution from the trust. The individual portion of my dad's trust is now being administrated by Fidelity. My mother and Fidelity are co-trustees. My mom already had very advanced Alzheimer's at the time my father made the trust and will This was diagnosed by the University of Pennsylvania memory facility, brain MRI's, etc. As soon as my dad died my brother told us he was executor. He began paying himself. He had my mom sign a stack of blank checks. I never saw the paperwork saying his is the POA but I know he had her sign checks. He moved her into memory facility. My mother did very well financially, he was her business. I fly to visit her 3x a year. I send a list of what I want changed. She is on a cot. I want her on a real bed. I wanted her to have dentures. Her legs have wounds. She even paid for my nephew to go to medical school and he is a dermatologist. I want her to have care. I am also concerned about the state of the finances. My father's attorney had given each os us a list of assets and told my brother to send us monthly reports. My brother changed the password to the Fidelity account. At one point he lost his job. My mother does not even remember my father anymore. I not only want to protect my mother, I also want to protect her assets. I need advice and I need to know my rights. I need to find a good attorney in PA.