Can I obtain a copy of accounting records since my mom assisgned a POA?

Question Details: My parents had a Will. My dad died and my mom had dimensia so my brother was appointed her heath care proxy and POA. He had sole control over all monies and my dad's pension/IRA'S, etc. coming and going out of my parent's estate until her recent death. I have 4 other siblings and we 6 are all equal beneficiaries. Can we and how do we obtain accounting records since my dad's passing 7 years ago?

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