WAC 357-01-202
WAC 357-01-202. Minor/dependent child
A biological, adopted, foster child, stepchild, legal ward, a child of a de facto parent, regardless of age or dependency status, or a child of a person standing in loco parentis, who is :
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Under eighteen years of age, or
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Eighteen years of age or older and incapable of self-care because of a mental or physical disability.
Persons who are in loco parentis are those with day-to-day responsibilities to care for and financially support a child.