One-family private manufactured homes (mobile homes). "One-family" shall be defined as one (1) or more persons who are related by blood or marriage, living together and occupying a single housekeeping unit with single kitchen facilities, or a group of not more than five (5) persons, excluding servants, living together by joint agreement and occupying a single housekeeping unit with single kitchen facilities, on a non-profit, cost sharing basis; shall include, but not be limited to, any home in which eight (8) or fewer unrelated mentally or physically handicapped persons reside, and may include two (2) additional persons acting as house parents or guardians who need not be related to each other or to any of the mentally or physically handicapped persons residing in the home; and shall include, but not be limited to, any private residence licensed by the Division of Family Services or Department of Mental Health to provide foster care to one (1) or more but less than seven (7) children who are unrelated to either foster parent by blood, marriage or adoption.