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My condolences on your loss. I am sorry to hear of your dilemma. I realize how frustrating this is for you, but I believe I have information which you will find helpful.
First, you can assert full ownership of the vehicle titled in your name. The sister has no claim to it.
When someone dies without a will, they are said to have died intestate
and their estate
is divided according to the provisions governing intestate succession in the probate
Under Washington state law, if your partner had no children, then the estate is distributed to his parents or his siblings in equal shares.
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