What steps are needed to finalize my mother's and father's estate/Wills?

Question Details:

Dad died 18 years ago; mom died just over a year. Their only Will states to give all to living spouse and then to give to the 3 kids of the marriage. The only thing of value in the estate, is the house($100,000), which I intend to buy. There will be no contesting of the Wills nor any arguments.

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