As a rule, societies with married families prefer neo–local living – living in a new place; thus, after marriage, a person separates from the nuclear family of his childhood (orientation family) and forms a new nuclear family (procreation family). Such systems usually assume that the mother's husband is also the biological father. The system uses special terms to refer to the nuclear family and is gradually becoming more classificatory as relatives become more and more collateral.
The system emphasizes the nuclear family. Members of the nuclear family use exclusively descriptive kinship terms, directly identifying only the husband, wife, mother, father, son, daughter, brother and sister. All other relatives are grouped into categories. Members of the nuclear family can be direct or collateral. Relatives for whom it is a family refer to them in descriptive terms that are based on terms used within the nuclear family, or use the term "nuclear family" directly.
The nuclear orientation family
Brother: the male child of one of the parents.
Sister: the daughter of one of the female parents.
Father: male parent.
Grandfather: the father of one of the parents.
Mother: a female parent.
Grandmother: the mother of one of the parents.
Nuclear married family
Husband: a male spouse.
Wife: a female spouse.
Son: the male child of one of the parents.
Grandson: the son of a minor.
Daughter: The female daughter of one of the parents(s).
Granddaughter: the child's daughter.
The nuclear nonlinear family
Spouse: husband or wife
Stepfather: The spouse of a parent who is not a biological parent
Sibling: sister or brother
Half-brother: A brother or sister with whom the subject has only one biological parent
Stepbrother: The child of a parent who is not the biological parent
A brother or sister is a side relative with minimal removal. For collateral relatives with one additional deletion, one generation more distant from the common ancestor on the maternal or paternal side, more classification terms come into play. These terms (aunt, uncle, niece and nephew) are not based on the terms used in the nuclear family, since most of them are not traditionally members of the household. In these terms, there is traditionally no distinction between collateral relatives and a person married to a collateral relative (both collateral and cumulative). Side relatives with additional moves on each side are cousins. This is the most general term, and it can be distinguished by degrees of security and by generation (deletion).