Does an estate get divided if one parent with a durable POA passes away?

Question Details: My parents have a Will. My mom signed a durable POA to my dad; she had to be placed for dementia. I am executor and listed as next agent if something happens to my dad. My mom will need continuing care and it is not cheap. Does the estate get divided, as stated in the will, if dad passes and mom remains alive? If my dad has durable POA and I am the next agent listed, does durable POA transfer to me?

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