My 21 year old son spends his whole check on drugs, contributes nothing to the house hold, and is disrespectful to his father and I.
Yes, you can evict him with 30 days notice.
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If your son has been living with you as a guest/licensee (as opposed to a tenant, co-tenant, or subtenant), you can ask him to leave at any time (30 days notice is not required), and can file an unlawful detainer if he refuses to leave.
If he has some kind of tenancy arrangement, then more formal notice would be required.
However, before you do any of this, you may want to consider talking to a social worker or similar professional to see if the dispute can be mediated, and the family relationship repaired. Kicking your son out through legal process could permanently damage (or destroy) your relationship with your son.
If you decide to proceed with eviction, I suggest that you talk to a local landlord-tenant attorney to get a more complete answer as to your legal rights and options.
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