In Custody of Nunn, 103 Wn. App. 871, 14 P.3d 175 (2000), the court held that a nonparent has standing to commence a child custody action only if the child is not in the physical custody of one of its parents or if the party filing the action alleges that neither parent is a suitable custodian, and it concluded that a nonparent does not have standing to seek custody of a child against a fit parent that has physical custody of the child.