Wash. Rev. Code § 26.11.040
(1)
(4) If the court finds that the petitioner has met the standard for rebutting the presumption in subsection (2) of this section, or if there is no presumption because no parent has custody of the child, the court shall consider whether it is in the best interest of the child to enter an order granting visitation. The petitioner must prove by clear and convincing evidence that visitation is in the child's best interest. In determining whether it is in the best interest of the child, the court shall consider the following, nonexclusive factors:
[ 2018 c 183 s 4.]