An unmarried or legally separated man or woman with one or both parents, or with one or more brothers or sisters, or with one or more legitimate, recognized natural or legally adopted children living with and dependent upon him or her for their chief support, where such brothers or sisters or children are not more than twenty one (21) years of age, unmarried and not gainfully employed or where such children, brothers or sisters, regardless of age are incapable of self-support because of mental or physical defect, or any of the beneficiaries mentioned in Article 154 of the Family Code who is living in the family home and dependent upon the head of the family for legal support.