What is ethical behavior for an executor and what are the responsibilities of a power-of-attorney?

Question Details: My brother is executor of my father and mother's wills while he and I are joint beneficiaries but not the only siblings. My father is deceased but my mother alive so she is the sole inheritor so far. Both my brother and I have a power-of-attorney for my mother. I fear my brother is "playing games" for his own benefit with my mother's money but then he always did and he's the one they picked. I'm not interested in inheritance, only my legal liability as POA if my brother's behavior is unethical. Do I need to get a lawyer and describe his behavior in detail to protect myself?

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