What to do if my mom's Will was not registered and my sister, the POA, took everything and now won't show us the so-called Will that she has?

Question Details: My mom passed on 02/11. She left behind 5 children, 1 of whom was one POA. That child, my sister, re-wrote my mom's Will from the original Will and changed the POA to herself on 01/21. At that time, mom lacked the mental capacity to do so and my sister took everything. My mom didn't have much but memories are priceless. She told me on many occasions that she did will her car to her grandson. None of her other 4 children has even seen this so called Will. We would like to have some of mom memories and to see the Will.

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