(b) Washington’s breathtakingly broad statute effectively permits a court to disregard and overturn any decision by a fit custodial parent concerning visitation whenever a third party affected by the decision files a visitation petition, based solely on the judge’s determination of the child’s best interest. A parent’s estimation of the child’s best interest is accorded no deference. The State Supreme Court had the opportunity, but declined, to give §26.10.160(3) a narrower reading. A combination of several factors compels the conclusion that §26.10.160(3), as applied here, exceeded the bounds of the Due Process Clause. First, the Troxels did not allege, and no court has found, that Granville was an unfit parent. There is a presumption that fit parents act in their children’s best interests, Parham v. J. R., 442 U.S. 584, 602; there is normally no reason for the State to inject itself into the private realm of the family to further question fit parents’ ability to make the best decisions regarding their children, see, e.g., Reno v. Flores, 507 U.S. 292, 304. The problem here is not that the Superior Court intervened, but that when it did so, it gave no special weight to Granville’s determination of her daughters’ best interests. More importantly, that court appears to have applied the opposite presumption, favoring grandparent visitation. In effect, it placed on Granville the burden of disproving that visitation would be in her daughters’ best interest and thus failed to provide any protection for her fundamental right. The court also gave no weight to Granville’s having assented to visitation even before the filing of the petition or subsequent court intervention.