You should spend the money necessary to consult with and retain a local probate attorney to protect your rights in the estate. Your brother should not be taking possession of the estate without establishing himself as the administrator with the probate court.
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You should probably start a Probate proceeding to make sure the estate is disbursed fairly.
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I agree with the other statements, you should likley hire counsel to open a probate proceeding which will give you the authroity to gather the assets of the estate and use the court's authority where your brother will not work with you. Unfortunatally this sort of situation is too common.
In some circumstances, small estates can be distributed in accord with the parent's wishes cooperatively, equitably, and without controversy. The fact that your sibling has taken possession of all financial records and belongings without giving you any information is a red flag. Probate is not difficult in Washington, and can give you more peace of mind. I suggest you consult a Washington lawyer to give you more detailed advice based on additional facts you will need to provide.
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