Can a step-parent be a de facto parent?

The Supreme Court of Washington ruled last week that a stepparent cannot be a de facto parent. Five years ago, that court acknowledged, in In re L.B., that a nonbiological mother in a lesbian couple was the de facto parent of the child she had raised from birth, for six years, with the biological mother. In last week's case, In re M.F., a six-member majority ruled that a court must decide whether