In this chapter, unless the context otherwise requires:
1. "Relative" means a parent or stepparent, ancestor, descendant, sibling, uncle or aunt, including an adoptive relative of the same degree through marriage or adoption, or a spouse.
2. "Restrain" means to restrict a person's movements without consent, without legal authority, and in a manner which interferes substantially with such person's liberty, by either moving such person from one place to another or by confining such person. Restraint is without consent if it is accomplished by:
(a) Physical force, intimidation or deception; or
(b) Any means including acquiescence of the victim if the victim is a child less than eighteen years old or an incompetent person and the victim's lawful custodian has not acquiesced in the movement or confinement.