Well, perhaps you can start by turning off the caps lock. If this person is your tenant and you are their landlord, then you have to start with a 3-day notice to pay the rent or vacate, or a 20-day notice to terminate the tenancy.
WA will enforce oral agreements for a landlord-tenant relationship. The fact that the room is furnished is not relevant to how you go about getting them out. If there is a history of this person paying rent it is easier for you to establish the landlord-tenant relationship. If this is your kid and they have never paid you rent, then this is a tenancy at will which cannot be ended by an evitiction action.
In some ways the 20-day takes longer but properly done it does not fail. You can bring an action later to recover rent they owe you but the critical part is getting them out legally. This is not self help law. Strongly recommend you discuss your situation with a local landlord-tenant attorney so they can give you advice based on more information. Hope this helps.
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