(a) The residence of the parent of a minor child, with whom that child last lived in a nonexcluded time setting, or guardian of a ward shall determine the residence of the child or ward for all social services governed by this chapter.
(b) For purposes of this chapter, a minor child is defined as being under 18 years of age unless otherwise specified in a program administered by the commissioner of human services; the commissioner of children, youth, and families; or the Direct Care and Treatment executive board.
(c) Physical or legal custody has no bearing on residence determinations. This section does not, however, apply to situations involving another state, limit the application of an interstate compact, or apply to situations involving state wards where the commissioner of human services or children, youth, and families is defined by law as the guardian.