As used in this chapter, the following terms shall have the meanings indicated:
Any house or other place where six or more children are received, cared for or kept, unattended by either their parents or legal guardians, for the purpose of providing such child or children with food, lodging, instruction or supervision for periods less than one day. This shall not include care by any person of a child related by blood or marriage or care of a child by any institution maintained by the State of New Jersey or by any municipality or by any incorporated charitable society or a Sunday nursery school maintained by a religious organization and carried on in its building used for religious and related purposes.