You would need rto file a third pqarty custody action alleging that the mother isn unfit. This is one of the most complex and diffcult petitons to prevail previal upon in Wa. state, so please hire counsel.
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I agree with the other posting; you will need to file a third party custody. However, keep in mind if a petition is filed in juvenile court for a Dependency action, the Superior Court will not have jurisdiction to hear your case. Third party custody cases require proof of custody of the child, and either the parents are unfit or the environment would be detrimental to the child if returned to the parents care. This statute can be confusing if you are not familiar with it. Let me know if can be of assistance. Good Luck!